BLI Model Development Capacity
Category	Development
Feature Dataset Name	STAND-ALONE
Item Name	bli_dev_capacity_taxlots_bps
Database Type	SDE
Originator	City of Portland
Bureau	Bureau of Planning and Sustainability
Publication Date	11/02/2009
Abstract	The first step of the Bureau of Planning & Sustainability's Buildable Lands Inventory (BLI) model is used to identify parcels that are likely to redevelop in the City of Portland -- parcels that are either vacant or significantly underutilizing their allowed development capacity. FAR and building height limits are the primary limiting factor on development in employment, commercial, and high-density residential areas. In multi-family and single-family residential areas, capacities are determined by the allowed number of residential units. This portion of the BLI modeling process consists of 3 basic steps: 1) calculate existing building square footages and allowed development limits (in terms of building square footage or number of residential units); 2) identify parcels using significantly less than their allowed development capacity (using less than 20% of available capacity, not including any development bonuses or incentives); 3) apply development constraints to these parcels and calculate remaining capacity in terms of building square footage, allowed number of residential units, and allowed number of jobs. The attached graphics illustrate the process in more detail. This featureclass is the result of that analysis. It is used to determine the total supply of residential and employment land, which is an input into subsequent steps of the BLI model, which allocates forecasted units and jobs to different areas of the City.
Purpose	To quantify the existing development capacity within Portland under current and proposed land use regulations; to identify likely redevelopment scenarios and prospective clusters of future development activity by identifying sites that are significantly underutilizing their allowed development capacity; to generate development capacity statistics for different areas of the City to highlight the differences in terms of existing and allowed development capacity; and to serve as a basis for predicting residential and employment allocation based on regional growth forecasts.
Supplemental Information	Complete documentation of the Bureau of Planning & Sustainability "Development Capacity GIS Model" is available upon request. The documentation explains in detail the inputs to the model, the methodology, and the GIS model results.
Last Dataset Update	05/20/2022 07:31
Last Source Update	05/18/2022 10:23
Maintenance/Update Frequency	As needed
Extent	City of Portland
Data Type	Vector
Shape Type	Polygon
Feature Count	41709
Horizontal Position Accuracy	Registered to tax lot base.
Horizontal Position Accuracy Link	Taxlots
Progress	Complete
North Bounding Coordinate	5724555.3856
South Bounding Coordinate	5689511.843
East Bounding Coordinate	-13633608.8765
West Bounding Coordinate	-13674120.8667
Theme Keyword(s)	development, capacity, utilization
Theme Keyword Thesaurus	None
Place Keyword(s)	Portland, Oregon
Place Keyword Thesaurus	None
Access Constraints	Available for Public Use
Use Constraints	These data are distributed under the terms of the City of Portland Data Distribution Policy. Care was taken in the creation of this data but it is provided "as is". The City of Portland cannot accept any responsibility for errors, omissions, or positional accuracy.
Source Dataset Type	File Geodatabase
Output Geodatabase	EGH_PUBLIC_WGS
Distribution	Grid: State plane coordinate system 1983(91). Units: International feet Datum: North American Datum of 1983/1991 (HPGN) Liability: The information in this file was derived from digital databases on the City of Portland GIS. Care was taken in the creation of this file. The City cannot accept any responsibility for errors, omissions, or positional accuracy. There are no warranties, expressed or implied. Format: Shapefile or File Geodatabase Feature Class - Data will be provided via City of Portland FTP Site. Online Resource: http://portlandmaps.com/opendata Online Instructions: City of Portland Public/Open Data is distributed via the PortlandMaps Open Data Site - http://portlandmaps.com/opendata. Data not available on the PortlandMaps Open Data site can be requested by contacting the City of Portland CGIS Group - maps@portlandoregon.gov Transfer Size: varies SPCS Zone Identifier: 5076
Contact(s) Add
Neil Loehlein 503-823-7061 503-823-7800 Neil.Loehlein@portlandoregon.gov 1900 SW 4th Avenue, Suite #7100 Portland, OR 97201 City of Portland - BPS 503-823-7700 503-823-7800 BPS@portlandoregon.gov
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Images	52965.png 181.64Kb X
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11/02/2009	The Development Capacity Analysis (DCA) GIS model consists of 3 basic steps: 1. calculate existing building square footages and allowed development limits (in terms of building square footage, number of units, or number of allowed lots); 2. identify “constrained” properties (i.e., significant environmental or historic resources); 3. identify development parcels significantly underutilizing their allowed development capacity (using less than 20% of available capacity, not including any development bonuses or incentives). Each of these steps is discussed in detail in the "Development Capacity Analysis GIS Model" report available from the City of Portland Bureau of Planning & Sustainability.

Web Services

Service	Description	Feature Access	Layer
BES_Layers	Referecne layers as used by various BES web content	Dynamic	BLI Development Capacity

Attribute Tables & Domains

X development_capacity_taxlots_pdx
Table Description
Table Jurisdiction
Column Sort	Column Name	Column Alias	Column Type	Column Size	Domain Value(s)	Column Description Add
1	STATE_ID	STATE_ID	String	20	Add	X The tax assessor state ID of the taxlot.
1	RNO	RNO	String	35	Add	X The secondary tax assessor account number of the taxlot. From County Assessor records.
1	OWNER1	OWNER1	String	35	Add	X The primary owner name (from County records).
1	SITEADDR	SITEADDR	String	37	Add	X The street address of the taxlot.
1	PRPCD_DESC	PRPCD_DESC	String	50	Add	X The Multnomah County "property code" for the taxlot. Property codes describe the predominant land use of the lot. Contact the Bureau of Planning & Sustainability for a list/description of all property codes.
1	IN_LRSBUFF	IN_LRSBUFF	String	255	Add	X "True" indicates lots that are partially or completely within 1,000' of a light rail station.
1	SUBDIST	SUBDIST	String	50	Add	X For lots within the Central City Plan District, the name of the Central City planning subdistrict.
1	GEN_USE	GEN_USE	String	255	Add	X The generalized predominant land use of each taxlot. Less specific than the County Assessor "property codes". County Assessor property codes generalized into categories by the Bureau of Planning & Sustainability.
1	GEN_ZONE	GEN_ZONE	String	255	Add	X The generalized comprehensive plan designation (CMP).
1	IS_VACANT	IS_VACANT	String	255	Add	X "True" indicates the lot or portion of a lot is vacant. Parcels are identified as vacant by Metro in their regional vacant lands inventory, or the Bureau of Planning & Sustainability in their industrial/employment lands inventory.
1	MAP120	MAP120	String	1	Add	X "Y" indicates an area is in a special "RH" or "IR" zone 4:1 FAR area (per code maps 120)
1	VALID_IL	VALID_IL	String	255	Add	X "True" indicates that the lot has a "valid" improvement/land value ratio (land value is greater than $0 and -- if a building is located on a lot -- improvement value is greater than $0). Note that valid does not mean accurate.
1	IS_SFR_MFR	IS_SFR_MFR	String	255	Add	X "True" indicates the lot is within a multi-family residential (MFR) zone and has been identified by the County Assessor as a SFR land use (meaning a single unit).
1	SIG_UNDERUT	SIG_UNDERUT	String	255	Add	X Flag that indicates lots significantly underutilize allowed development capacity (all lots in this featureclass have a value of "True")
1	Geog_Spec	Geog_Spec	String	30	Add	X The "employment geography" of the lot (per the BPS Employment Opportunities Analysis project)
1	conTranCap	conTranCap	String	5	Add	X Transportation capacity constraint (refer to the attached table for a complete description of the mapping methodology for all constraints)
1	conTranInt	conTranInt	String	5	Add	X ODOT highway interchanges constraint
1	conTranSub	conTranSub	String	5	Add	X Substandard and unimproved streets constraint
1	conWater	conWater	String	5	Add	X Water system constraints
1	conSewer	conSewer	String	5	Add	X Sewer system constraints
1	conStorm	conStorm	String	5	Add	X Stormwater system constraints
1	conAirHgt	conAirHgt	String	5	Add	X Airport approach and departure cone constraint
1	conNoise	conNoise	String	5	Add	X Airport noise constraint
1	conHeliprt	conHeliprt	String	5	Add	X Heliport landing constraint
1	conView	conView	String	5	Add	X Scenic view constraints
1	conHist	conHist	String	5	Add	X Areas within a historic or conservation district
1	conPrvCom	conPrvCom	String	5	Add	X Private common open space
1	conGW	conGW	String	5	Add	X Willamette River greenway constraint
1	conSlp25	conSlp25	String	5	Add	X Slopes over 25%
1	conNatAm	conNatAm	String	5	Add	X Areas requiring archaeological scan or consultation with tribes
1	conLSHA	conLSHA	String	5	Add	X Regulatory landslide hazard area constraint
1	conSLIDO	conSLIDO	String	5	Add	X Landslide history constraint
1	conCovrly	conCovrly	String	5	Add	X Environmental conservation (c) overlay constraint
1	conPovrly	conPovrly	String	5	Add	X Environmental protection (p) overlay constraint
1	conFld100	conFld100	String	5	Add	X FEMA 100-year floodplain constraint
1	conFldway	conFldway	String	5	Add	X FEMA floodway constraint
1	conECSI	conECSI	String	5	Add	X Brownfield constraint (from DOGAMI environmentally-contaminated site inventory)
1	conLUST	conLUST	String	5	Add	X Leaking underground storage tank constraint
1	conHistLdm	conHistLdm	String	5	Add	X Historic and conservation landmarks
1	conPubOwn	conPubOwn	String	5	Add	X Publicly-owned properties that do not provide for employment or residential uses
1	conInstit	conInstit	String	5	Add	X Institutional campuses constraint
1	conWetland	conWetland	String	5	Add	X Wetlands constraint
1	NEW_LOT	NEW_LOT	String	255	Add	X "True" indicates the polygon represents a portion of a lot that is vacant and is considered a likely new lot should development occur (and thus is assigned it's own unique LOT ID).
1	MKTVALYR3	MKTVALYR3	String	11	Add	X The current-year "market" value of the taxlot. From County Assessor records.
1	INSTITUTE	INSTITUTE	String	255	Add	X "True" indicates the lot is owned by a major institution (public/private university, hospital, etc.)
1	REG_ZONE	REG_ZONE	String	255	Add	X A system of generalized jurisdictional zoning that groups relatively equivalent zones from different jurisdictions into a single classification. Used by Metroscope model.
1	IN_FTBUFF	IN_FTBUFF	String	255	Add	X "True" indicates that the lot is within 500' of a "frequent service" transit line (bus or light rail). Frequent service is defined as transit that runs every 15 minutes or better during weekday peak hours.
1	TLID	TLID	String	25	Add	X State ID in Multnomah County format
1	BLI_ACTION	BLI_ACTION	String	255	Add	X Used to manually flag lots for addition or removal from the inventory of underutilized lots.
1	Size_Class	Site Size Category	String	30	Add	X General size categories for the underutilized development site (the total area of the lot PLUS any adjacent underutilized lots)
1	Land_Class	Underutilized Land Class	String	15	Add	X The underutilized land classification (vacant land, or redevelopment site where existing structures would be demolished or renovated)
1	CMP	Comp Plan	String	20	Add	X
1	FARB_UNUSED	FARB_UNUSED	Numeric	8	Add	X The amount of allowed FAR square footage (including bonuses) not currently being used by existing development on the lot or portion of a lot. Formula: [FARB_SQFT] - [EBLD_SQFT]
1	FARB_HEADHT	FARB_HEADHT	Numeric	8	Add	X The height of the FAR envelope (including bonuses) that is not currently being used by existing development. Formula: [FARB_HGT] - [GBLD_HT]
1	FAR_UTIL	FAR_UTIL	Numeric	8	Add	X The average "FAR Utilization Rate" of the property/zone. Derived from past development trends. Currently only used in the Central City.
1	MFRU_AFAR	MFRU_AFAR	Numeric	8	Add	X Number of allowed multi-family units for the lot or portion of a lot in zones where development IS limited by FAR. Based on "base" FAR. Formula: [FAR_SQFT] / Estimated average MFR unit size.
1	MFRU_AFARB	MFRU_AFARB	Numeric	8	Add	X Number of allowed multi-family units for the lot or portion of a lot in zones where development IS limited by FAR. Based on "bonus" FAR. Formula: [FARB_SQFT] / Estimated average MFR unit size.
1	MFRU_ATOT	MFRU_ATOT	Numeric	8	Add	X Total estimated number of allowed multi-family units for the lot or portion of a lot. Based on "base" FAR where applicable. Formula: [MFRU_AFAR] + [MFRU_ALLOW].
1	MFRU_ATOTB	MFRU_ATOTB	Numeric	8	Add	X Total estimated number of allowed multi-family units for the lot or portion of a lot. Based on "bonus" FAR where applicable. Formula: [MFRU_AFARB] + [MFRU_ALLOW].
1	INST_FAR	INST_FAR	Numeric	8	Add	X Institutional FAR per master plan (for institutional campuses where master plans exist)
1	INST_SQFT	INST_SQFT	Numeric	8	Add	X Total square footage of institutional capacity (where institutional master plans exist)
1	EMP_FAR	EMP_FAR	Numeric	8	Add	X Employment capacity expressed as FAR (excludes industrial areas and institutions with master plans) [FAR_SQFTC / LOT AREA]
1	EMP_SQFT	EMP_SQFT	Numeric	8	Add	X Total employment capacity in square feet (including institutional capacity, less industrial zones) [INST_SQFT + FAR_SQFTC]
1	NET_SFRL	NET_SFRL	Numeric	8	Add	X The net capacity (allowed less existing) of potential single-family residential (SFR) lots for a lot or portion of a lot. Formula: [SFRL_ALLOW] - [SFRL_EXIST]. Must be summarized by "Lot ID" to get a total count by individual lot.
1	NET_MFRU	NET_MFRU	Numeric	8	Add	X The net capacity (allowed less existing) of multi-family residential (MFR) units for a lot or portion of a lot. Formula: [MFRU_ALLOW] - [MFRU_EXIST]. Must be summarized by "Lot ID" to get a total unit count for an individual lot.
1	NET_MFRUB	NET_MFRUB	Numeric	8	Add	X The net capacity (allowed less existing) of MFR units for a lot or portion of a lot under base + bonus FAR. Formula: [MFRU_ALLOW] - [MFRU_EXIST]. Must be summarized by "Lot ID" to get a total unit count for an individual lot.
1	NET_ALLOW	NET_ALLOW	Numeric	8	Add	X Net residential unit capacity for each lot or portion of a lot (allowed - existing); based on allowed SFR lots, or total number of allowed MFR units under base FAR. Estimated using an average unit size for each comp plan zone. Weighted by lot area.
1	NET_ALLOWB	NET_ALLOWB	Numeric	8	Add	X Net residential unit capacity for each lot or portion of a lot (allowed - existing); based on allowed SFR lots, or total number of allowed MFR units under base + bonus FAR. Estimated using average unit size by comp plan zone. Weighted by lot area.
1	MFRU_EXIST	MFRU_EXIST	Numeric	8	Add	X Total number of estimated existing multi-family residential units on the lot or portion of a lot. Weighted by lot area. Formula: ([SHAPE_AREA] / [LOT_AREA]) X Total MFR units. Must be summarized by "Lot ID" to get a total count by individual lot.
1	MFRU_ALLOW	MFRU_ALLOW	Numeric	8	Add	X Number of allowed multi-family units for the lot or portion of a lot in MFR zones where development IS NOT limited by FAR. Formula: [SHAPE_AREA] / Maximum MFR density of the zone. Truncated and rounded based on zoning code rules.
1	MFRU_RATIO	MFRU_RATIO	Numeric	8	Add	X The ratio of existing MFR units to allowed MFR units. Formula: [MFRU_EXIST] / [MFRU_ALLOW]
1	MFRU_REM	MFRU_REM	Numeric	8	Add	X The difference between the number of MFR units allowed and the number of existing units. Formula: [MFRU_ATOT] - [MFRU_EXIST]
1	OBJECTID	OBJECTID	Numeric	8	Add	X A unique software ID for each polygon. May change when data is modified.
1	SFRL_EXIST	SFRL_EXIST	Numeric	8	Add	X The number of existing single-family residential (SFR) lots weighted by lot area. Formula: ([SHAPE_AREA] / [LOT_AREA]) X 1. Must be summarized by "Lot ID" to get a total count by individual lot.
1	SFRL_ALLOW	SFRL_ALLOW	Numeric	8	Add	X The number of allowed single-family residential (SFR) lots weighted by lot area. Formula: ([SHAPE_AREA] / [LOT_AREA]) X [SFR_LOTS]. Must be summarized by "Lot ID" to get a total count by individual lot.
1	EBLD_SQFTR	EBLD_SQFTR	Numeric	8	Add	X Estimated existing building square footage devoted to residential use. Based on building permit history analysis of commercial/residential split by comp plan designation.
1	FAR_SQFTR	FAR_SQFTR	Numeric	8	Add	X Estimated allowed building square footage devoted to residential use (under base FAR limits). Based on building permit history analysis of commercial/residential split by comp plan designation.
1	FARB_SQFTR	FARB_SQFTR	Numeric	8	Add	X Estimated allowed building square footage devoted to residential use (under base + bonus FAR limits). Based on building permit history analysis of commercial/residential split by comp plan designation.
1	EXIST_UN	EXIST_UN	Numeric	8	Add	X Total number of existing residential units for each lot or portion of a lot; based on existing SFR lots, or total number of existing MFR units (estimated using an average unit size for each comp plan zone). Weighted by lot area.
1	ALLOW_UN	ALLOW_UN	Numeric	8	Add	X Total number of allowed residential units for each lot or portion of a lot; based on allowed SFR lots, or total number of allowed MFR units under base FAR (estimated using an average unit size for each comp plan zone). Weighted by lot area.
1	ALLOW_UNB	ALLOW_UNB	Numeric	8	Add	X Total number of allowed residential units for each lot or portion of a lot; based on allowed SFR lots, or total number of allowed MFR units under base + bonus FAR (estimated using an average unit size for each comp plan zone). Weighted by lot area.
1	EBLD_SQFTC	EBLD_SQFTC	Numeric	8	Add	X Estimated existing building square footage devoted to commercial use. Based on building permit history analysis of commercial/residential split by comp plan designation.
1	FAR_SQFTC	FAR_SQFTC	Numeric	8	Add	X Estimated allowed building square footage devoted to commercial use (under base FAR limits). Based on building permit history analysis of commercial/residential split by comp plan designation.
1	FARB_SQFTC	FARB_SQFTC	Numeric	8	Add	X Estimated allowed building square footage devoted to commercial use (under base + bonus FAR limits). Based on building permit history analysis of commercial/residential split by comp plan designation.
1	Rate_Res_Adj	Rate_Res_Adj	Numeric	8	Add	X Adjusted residential capacity utilization rate factoring in effects of multiple constraints (3 or more constraints get an additional 20% deduction, 2 or more constraints an additional 10% deduction)
1	Rate_Emp_Adj	Rate_Emp_Adj	Numeric	8	Add	X Adjusted employment capacity utilization rate factoring in effects of multiple constraints (3 or more constraints get an additional 20% deduction, 2 or more constraints an additional 10% deduction)
1	SFRL_CDED	SFRL_CDED	Numeric	8	Add	X Net loss of SFR lot capacity due to constraints. Formula: [NET_SFRL] - [NET_SFRLC]
1	NET_SFRLC	NET_SFRLC	Numeric	8	Add	X The net capacity (allowed less existing less constraint deduction) of potential single-family residential (SFR) lots for a lot or portion of a lot. Formula: [NET_SFRL] * [Rate_Res_Adj]. Must be summarized by "Lot ID" to get a total count by individual lot.
1	MFRU_CDED	MFRU_CDED	Numeric	8	Add	X Net loss of MFR unit capacity due to constraints. Formula: [NET_MFRU] - [NET_MFRUC]
1	NET_MFRUC	NET_MFRUC	Numeric	8	Add	X The net MFR capacity (allowed less existing less constraint deduction) of potential multifamily residential (MFR) units for a lot or portion of a lot. Formula: [NET_MFRU] * [Rate_Res_Adj]. Must be summarized by "Lot ID" to get a total count by individual lot.
1	NET_ALLOW_CDED	NET_ALLOW_CDED	Numeric	8	Add	X Net loss of total unit (SFR & MFR) capacity due to constraints. Formula: [NET_ALLOW] - [NET_ALLOWC]
1	NET_ALLOWC	NET_ALLOWC	Numeric	8	Add	X The net capacity (allowed less existing less constraint deduction) of potential residential (SFR and MFR) units for a lot or portion of a lot. Formula: [NET_ALLOW] * [Rate_Res_Adj]. Must be summarized by "Lot ID" to get a total count by individual lot.
1	ADJ_MARKET_FAR	ADJ_MARKET_FAR	Numeric	8	Add	X A floor-area ratio (FAR) adjustment for employment areas that reflects known utilization of allowed FAR.
1	EMP_SQFTC	EMP_SQFTC	Numeric	8	Add	X The net capacity (allowed less constraint deduction) of potential employment square footage for a lot or portion of a lot. Formula: [EMP_SQFT] * [Rate_Emp_Adj]. Must be summarized by "Lot ID" to get a total sum by individual lot.
1	EMP_FARC	EMP_FARC	Numeric	8	Add	X Constrained employment capacity expressed as FAR (excludes industrial areas and institutions with master plans) Formula: [EMP_FAR] * [Rate_Emp_Adj]
1	EMP_SQFTMF	EMP_SQFTMF	Numeric	8	Add	X The net capacity (allowed less constraint deduction) of potential employment square footage for a lot or portion of a lot, adjusted for market FAR utilization. Formula: If [EMP_FARC] > [EMP_FARMF], Lot Area * [EMP_FARMF], else [EMP_SQFTC]. Must be summarized by "Lot ID" to get a total sum by individual lot.
1	EMP_FARMF	EMP_FARMF	Numeric	8	Add	X Constrained employment capacity expressed as FAR, adjusted for market FAR utilization(excludes industrial areas and institutions with master plans).
1	NET_EMP_SQFT	NET_EMP_SQFT	Numeric	8	Add	X The net capacity (allowed less existing) of potential employment square footage for a lot or portion of a lot. Formula: [EMP_SQFT] - [EBLD_SQFT]. Must be summarized by "Lot ID" to get a total count by individual lot.
1	NET_EMP_SQFTC	NET_EMP_SQFTC	Numeric	8	Add	X The net capacity (allowed less existing less constraint deduction) of potential employment square footage for a lot or portion of a lot. Formula: [NET_EMP_SQFT] * [Rate_Emp_Adj]. Must be summarized by "Lot ID" to get a total count by individual lot.
1	NET_EMP_SQFTMF	NET_EMP_SQFTMF	Numeric	8	Add	X The net capacity (allowed less existing less constraint deduction) of potential employment square footage for a lot or portion of a lot, adjusted for market FAR utilization. Formula: [EMP_SQFTMF] - [EBLD_SQFT]. Must be summarized by "Lot ID" to get a total count by individual lot.
1	BLDG_SQFT_JOB	BLDG_SQFT_JOB	Numeric	8	Add	X Average sqft per job assumption (based on comp plan designation)
1	NET_JOBS	NET_JOBS	Numeric	8	Add	X The net capacity (allowed less existing) of potential jobs for a lot or portion of a lot. Formula: [NET_EMP_SQFT] / [BLDG_SQFT_JOB]. Must be summarized by "Lot ID" to get a total count by individual lot.
1	JOBS_CDED	JOBS_CDED	Numeric	8	Add	X Net loss of job capacity due to constraints. Formula: [NET_JOBS] - [NET_JOBSC]
1	NET_JOBSC	NET_JOBSC	Numeric	8	Add	X The net capacity (allowed less existing less constraint deduction) of potential jobs for a lot or portion of a lot. Formula: [NET_EMP_SQFTC] / [BLDG_SQFT_JOB]. Must be summarized by "Lot ID" to get a total count by individual lot.
1	JOBS_MFDED	JOBS_MFDED	Numeric	8	Add	X Net loss of job capacity due to constraints and market FAR adjustment. Formula: [NET_JOBS] - [NET_JOBSMF]
1	NET_JOBSMF	NET_JOBSMF	Numeric	8	Add	X The net capacity (allowed less existing less constraint deduction) of potential jobs for a lot or portion of a lot, adjusted fro market FAR utilization. Formula: [NET_EMP_SQFTMF] / [BLDG_SQFT_JOB]. Must be summarized by "Lot ID" to get a total count by individual lot.
1	Rate_Res	Rate_Res	Numeric	8	Add	X Utilization rate for residential capacity, factoring in all individual constraints
1	Rate_Emp	Rate_Emp	Numeric	8	Add	X Utilization rate for employment capacity, factoring in all individual constraints
1	TOTDEVAREA	TOTDEVAREA	Numeric	8	Add	X For lots identified as "underutlized", the total area of the lot PLUS any adjacent underutilized lots (the total potential "site area" should the lots be developed simultaneously)
1	BLDFT_SQFT	BLDFT_SQFT	Numeric	8	Add	X The building footprint square footage of the lot or portion of a lot. Derived from the City of Portland 3D building model.
1	BLD_MAXHGT	BLD_MAXHGT	Numeric	8	Add	X The maximum building height of any existing buildings on the lot. Derived from the City of Portland 3D building model.
1	DEV_PERC	DEV_PERC	Numeric	8	Add	X The percentage of surface area of each lot or portion of a lot that is developed (within an existing building footprint). Formula: [BLDFT_SQFT] / [SHAPE_AREA]
1	FAR_SQFT	FAR_SQFT	Numeric	8	Add	X For areas where development is limited by FAR, the total building square footage allowed on the lot or portion of a lot. Formula: [FARINT] X [SHAPE_AREA]
1	FARB_SQFT	FARB_SQFT	Numeric	8	Add	X For areas where development is limited by FAR, the total building square footage allowed on the lot or portion of a lot (including any allowed bonuses). Formula: [FARBINT] X [SHAPE_AREA]
1	UNDEV_SQFT	UNDEV_SQFT	Numeric	8	Add	X The square footage of the lot that is not currently developed as a building. Formula: [SHAPE_AREA] - [BLDFT_SQFT]
1	EBLD_SQFT	EBLD_SQFT	Numeric	8	Add	X The existing building square footage; estimated from Portland 3D model. Derived from either known square footages, or estimated gross square footages when the square footage is not known. Refer to GIS model documentation for more info.
1	EBLD_FAR	EBLD_FAR	Numeric	8	Add	X The estimate floor-area ratio (FAR) of any existing development. Estimated using the Portland 3D building model. Formula: [EBLD_SQFT] / [SHAPE_AREA]
1	GBLD_HGT	GBLD_HGT	Numeric	8	Add	X The "generalized" building height for each lot or portion of a lot. Represents the height of the FAR envelope of any existing development on the lot. Formula: [EBLD_FAR] X [FLOOR_HT]
1	FAR_RATIO	FAR_RATIO	Numeric	8	Add	X For areas where FAR limits development, the ratio of estimated existing building square footage to allowed FAR square footage. Formula: [EBLD_SQFT] / [FAR_SQFT]
1	FAR_UNUSED	FAR_UNUSED	Numeric	8	Add	X The amount of allowed FAR square footage not currently being used by existing development on the lot or portion of a lot. Formula: [FAR_SQFT] - [EBLD_SQFT]
1	FARB_RATIO	FARB_RATIO	Numeric	8	Add	X For areas where FAR limits development, the ratio of estimated existing building square footage to allowed FAR square footage (including bonuses). Formula: [EBLD_SQFT] / [FARB_SQFT]
1	FAR_HEADHT	FAR_HEADHT	Numeric	8	Add	X The height of the FAR envelope that is not currently being used by existing development. Formula: [FAR_HGT] - [GBLD_HT]
1	FARNUM	FARNUM	Numeric	8	Add	X Where development is limited by floor-area ratio (FAR), the "base" floor-area ratio (FAR) of the lot or portion of a lot as a numeric attribute. A value of 6 therefore means 6:1.
1	FARBNUM	FARBNUM	Numeric	8	Add	X Base + bonus floor-area ratio (FAR) of the lot or portion of a lot as a numeric attribute. A value of 8 therefore means 8:1.
1	LANDVAL3	LANDVAL3	Numeric	8	Add	X The current-year land value of the taxlot. From County Assessor records.
1	BLDGVAL3	BLDGVAL3	Numeric	8	Add	X The current-year value of any improvements (buildings) on the taxlot. From County Assessor records.
1	TOTALVAL3	TOTALVAL3	Numeric	8	Add	X The total combined land and improvement value of the taxlot. From County Assessor records.
1	IL_RATIO	IL_RATIO	Numeric	8	Add	X The improvement to land value ratio (I/L) for the lot. Based on the Multnomah County Assessor current year improvement and land values. Formula: where [LANDVAL3] > 0, [BLDGVAL3] / [LANDVAL3]
1	YEARBUILT	YEARBUILT	Integer	2	Add	X The year of construction for any improvements on the lot. From County Assessor records.
1	FARFLRS	FARFLRS	Integer	4	Add	X The number of floors in the FAR envelope.
1	FARBFLRS	FARBFLRS	Integer	4	Add	X The number of floors in the bonus FAR envelope.
1	FLOOR_HT	FLOOR_HT	Integer	4	Add	X The estimated floor-to-floor height of the building. Based on the building use as defined by the Assessor (GEN_USE).
1	FAR_HGT	FAR_HGT	Integer	4	Add	X Estimated height of the FAR envelope for the lot or portion of a lot. Formula: [FARFLRS] X [FLOOR_HT]
1	FARB_HGT	FARB_HGT	Integer	4	Add	X Estimated height of the FAR envelope for the lot or portion of a lot (including any allowed bonuses). Formula: [FARBFLRS] X [FLOOR_HT]
1	SFR_LOTS	SFR_LOTS	Integer	4	Add	X The total allowed number of single-family residential (SFR) lots for each lot within a SFR zone. Formula: [LOT_AREA] / maximum SFR density of the SFR zone. Truncated and rounded based on zoning code rules.
1	Numb_Const_Res	Numb_Const_Res	Integer	4	Add	X Total number of residential constraints on the lot or portion of a lot
1	Numb_Const_Emp	Numb_Const_Emp	Integer	4	Add	X Total number of employment constraints on the lot or portion of a lot
1	OBJECTID_1	OBJECTID	Integer	4	Add	X
1	OBJECTID_12	OBJECTID	Integer	4	Add	X
1	LOT_ID	LOT_ID	Integer	4	Add	X A unique ID for each taxlot. Assigns IDs to portions of lots identified as vacant or manually identified as significantly "underutilized" (see the "Sig_Underut" attribute for more information).