Unique Building Identifier file


About the data

The Unique Building Identifier file is designed to capture the complete inventory of multifamily buildings on which funds from subsidized housing programs have been spent. This file is intended to capture all multifamily units ever subsidized by either HOME or LIHTC, without duplication. The buildings in the file are unique according to their address and are identified by a key variable based on the building’s location, the programs under which the building has received subsidy, and date on which the subsidy began. This data set has been requested by organizations interested in preservation of the affordable housing stock, and should be useful to researchers both Federal and non-Federal.

Download Unique Building Identifier Data File

Data sources

The current data file is comprised of addresses from administrative data on the HOME program and a roster of LIHTC properties. The HOME program property data dates from the program’s inception in 1992 until 2012. Data on LIHTC dates spans years 1987 until 2009 when the last roster of properties was made available.

Matching of data source files

The HOME and LIHTC data files were matched using address data validated and standardized through HUD’s Geocode Service Center.

Data file variables

BuildingID – Unique key for each unique building or address. The key is a combination of 2-digit state code; 2-digit year (year building came into service/subsidy); initial subsidy program code

(L=LIHTC; H=HOME); 6-digit sequencing number; and an indicator of or placeholder for additional subsidy programs (L=LIHTC; H=HOME; X=placeholder)—up to 5 “sub” programs can be flagged, if applicable.

Example - CT96H000002LXXXX is the second property placed in service in Connecticut in 1996 to receive HOME funds. It also received LIHTC subsidy.

Street_Address – building street address

Note to users

This file will be updated periodically to improve the quality of the indicator and the accuracy of the address data.


Because errors in the underlying data are expected and can only be identified by people with local knowledge, your feedback is essential to improving the quality and utility of the data. Please forward your comments and questions to Dwight.M.Jefferson@hud.gov with “Unique Building Identifier Data” in the subject line.