1.0 DCPLUS 20260520 18312000 20260520 18312000 https://www.arcgis.com/home/item.html?id=fe75812a2bf84fbd9ab54994a147dbd1 fe75812a2bf84fbd9ab54994a147dbd1 Feature Service https://services1.arcgis.com/KUeKSLlMUcWvuPRM/arcgis/rest/services/AltExtStructure_2025/FeatureServer https://www.arcgis.com/sharing/rest/content/items/fe75812a2bf84fbd9ab54994a147dbd1/info/thumbnail/ago_downloaded.png AltExtStructure 2025 <span style='border:0px solid currentcolor; box-sizing:border-box; font-style:normal; font-variant-caps:normal; font-variant-ligatures:common-ligatures; font-weight:400; letter-spacing:normal; line-height:1.5; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'>Alterations for Existing Structures describes the proportion of parcels in a census tract with permits qualifying as either an Addition, Demolition or Renovation in a given year. The measure is derived from approved building permits reported by the Inspectional Services Department (ISD) of the City of Boston. The Boston Area Research Initiative (BARI) has developed and publishes multiple measures from these records to describe patterns of construction and their impacts on land use and value annually and over time in Boston.<span style='border:0px solid currentcolor; box-sizing:border-box; font-style:normal; font-variant-caps:normal; font-variant-ligatures:common-ligatures; font-weight:400; letter-spacing:normal; line-height:1.5; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'> You can find and download the source shapefile from BARI’s ArcGIS Library by clicking <a style='background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:border-box; color:rgb(0, 97, 155); font-family:"Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px; font-style:normal; font-variant-caps:normal; font-variant-ligatures:normal; font-weight:400; letter-spacing:normal; line-height:1.5; text-align:start; text-decoration:none; text-indent:0px; text-transform:none; word-spacing:0px;' target='_blank' href='https://nu.maps.arcgis.com/home/item.html?id=9213d0366bab40a6a48194c555720985' rel='nofollow ugc noopener noreferrer'>this link</a><span style='border:0px solid currentcolor; box-sizing:border-box; font-style:normal; font-variant-caps:normal; font-variant-ligatures:common-ligatures; font-weight:400; letter-spacing:normal; line-height:1.5; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'>. Additional documentation and the data in .csv (i.e., spreadsheet) format are available through the BARI Data Library <a style='background-color:rgb(255, 255, 255); border:0px solid currentcolor; box-sizing:inherit; color:rgb(0, 97, 155); font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:large; font-style:normal; font-variant-caps:normal; font-variant-ligatures:common-ligatures; font-weight:400; letter-spacing:normal; line-height:1.5; text-align:start; text-decoration:none; text-indent:0px; text-transform:none; word-spacing:0px;' target='_blank' href='https://dataverse.harvard.edu/dataset.xhtml?persistentId=doi:10.7910/DVN/XZXAUP' rel='nofollow ugc noopener noreferrer'>here</a><span style='border:0px solid currentcolor; box-sizing:border-box; font-style:normal; font-variant-caps:normal; font-variant-ligatures:common-ligatures; font-weight:400; letter-spacing:normal; line-height:1.5; text-align:start; text-decoration-color:initial; text-decoration-style:initial; text-indent:0px; text-transform:none; word-spacing:0px;'>."Alterations for Existing Structures" is the proportion of parcels in a census tract with permits qualifying as either an Addition, Demolition or Renovation. fe75812a2bf84fbd9ab54994a147dbd1 https://services1.arcgis.com/KUeKSLlMUcWvuPRM/arcgis/rest/services/AltExtStructure_2025/FeatureServer Feature Service 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