Land Boundary Change

The dataset contains locations and attributes of owner lines with dimensions. The tax information (attribution) comes from the Office of Tax and Revenue's Public Extract file. The creation of this layer is automated, occurs weekly, and uses the most currently available tax information. The date of the extract can be found in the EXTRACTDAT field in this layer.

When Condos are approved for ground lots, those lots remain in the production (active) layer and attributes updated to reflect Condominium dwelling. 1.) Approved for Ground (Record Lots) When condos are approved for ground lots, the following fields are updated and the“Condo_Lot”field populated with a “Y” value UNDERLIES_CONDO = 1 CONDO_BOOK_NUM CONDO_PAGE_NUM CONDO_REGIME_NUM CONDOLOT = Y 2.) Approved for Ground (History Record Lots). As some have been replaced (killed) by another Record Lot, that's also a condo lot. When condos are approved for ground lots, the following fields are updated and the “Condo_Lot”field populated with a “Y” value UNDERLIES_CONDO = 1 CONDO_BOOK_NUM CONDO_PAGE_NUM CONDO_REGIME_NUM CONDOLOT = Y When Condos are approved for overlay lots, those lots are killed (retired / dead lots) and archived to their respective history layer. 3.) Approved for Overlays (Air Rights & Tax Lots). In the future, Parcels may be used. The following fields are updated and the “Condo_Lot” field populated with a “Y” value UNDERLIES_CONDO = 1 CONDO_BOOK_NUM CONDO_PAGE_NUM CONDO_REGIME_NUM CONDOLOT = Y Condo dwellings can also be queried city-wide via the individual VPM layers (active Record lots, dead Air Rights & Tax lots) where the value in the “UNDERLIES_CONDO” field is equal to 1.The following fields are populated once Condo Lots have been approved: Condo_Book_Num Condo_Page_Num Condo_Regime_Num

This table is a subset of ITSPE and represents vacant and blighted property. The tax assessment roll public extract (ITSPE) is used for assessment and property analysis, to send property tax bills and notices, and stores comprehensive tax information such as ownership, mailing addresses, non-contiguous Air Rights lots (Multifamily or Development), Air Rights lots, possessory interest lots, record lots, tax lots, parcels, condominiums, and federally owned lands such as reservations and appropriations. The linkage from the Vector Property layers to this database is SSL (Square, Suffix, and Lot). It should be noted that not all record lots have a direct 1:1 relationship to information in this database. The most obvious examples would be when a tax lot was created from existing record lots. In this case, only the tax lot would have linkage to the ITSPE, not the underlying record lots (though they still exist). Reservations that have been converted into tax lots are an additional example where the reservation still exists, however for taxation purposes the tax lot (overlay) supersedes and has corresponding linkage to ITS. The same is true for most Condominiums and the ground surface lot (Record) which still exist (common space) or the previous overlay (Air Right or Tax lot), only the Condo lot would have linkage to (ITSPE).

This layer is a subset of ITSPE and and UBIDs representing vacant and blighted property building footprints. The tax assessment roll public extract (ITSPE) is used for assessment and property analysis, to send property tax bills and notices, and stores comprehensive tax information such as ownership, mailing addresses, non-contiguous Air Rights lots (Multifamily or Development), Air Rights lots, possessory interest lots, record lots, tax lots, parcels, condominiums, and federally owned lands such as reservations and appropriations. The linkage from the Vector Property layers to this database is SSL (Square, Suffix, and Lot). The UBID data was originally created by spatially joining the 2019 building footprints published in DC Open Data with the Common Ownership Lots. The UBIDs were coded using US DOE’s Implementation code. Search for UBID and ITSPE in Open Data DC for individual documentation.

The dataset contains locations and attributes of building construction and alteration permits applied for and approved by the District of Columbia Department of Buildings. These data are shared via an automated process where addresses are batch matched (geocoded) to the District's Master Address Repository. Users may find that some data points will contain 0,0 for X,Y coordinates resulting in inconsistent spatial locations. Addresses for these data points could not be automatically geocoded and will need to be manually geocoded to 'best fit' locations in DC.

Data source is the Office of Tax and Revenue’s Computer-Assisted Mass Appraisal (CAMA) system. The CAMA system is used by the Assessment Division (AD) within the Real Property Tax Administration to value real estate for ad valorem real property tax purposes. The intent of this data is to provide a sale history for active properties listed among the District of Columbia’s real property tax assessment roll. This data is updated daily. The AD constantly maintains sale data, adding new data and updating existing data. Daily updates represent a “snapshot” at the time the data was extracted from the CAMA system, and data is always subject to change.