1.0 DCPLUS 20260520 18290000 20260520 18290000 https://www.arcgis.com/home/item.html?id=c756022843ca4af08c5640beb675ba48 c756022843ca4af08c5640beb675ba48 Feature Service https://services1.arcgis.com/KUeKSLlMUcWvuPRM/arcgis/rest/services/Additions_2025/FeatureServer https://www.arcgis.com/sharing/rest/content/items/c756022843ca4af08c5640beb675ba48/info/thumbnail/ago_downloaded.png Additions 2025 Addition is the proportion of parcels in a census tract with approved permits indicating an addition (or other extensive change) to an existing structure.<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;'>Addition describes the proportion of parcels in a census tract with permits indicating an addition (or other extensive change) to an existing structure 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 published multiple measures from these records to describe patterns of construction and their impacts on land use and value annually and over time in Boston. 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=d2e7d85224b14b3cb88dd77a7d23d135' 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:border-box; 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: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://dataverse.harvard.edu/dataset.xhtml?persistentId=doi:10.7910/DVN/B7DHBK' 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;'>. c756022843ca4af08c5640beb675ba48 https://services1.arcgis.com/KUeKSLlMUcWvuPRM/arcgis/rest/services/Additions_2025/FeatureServer Feature Service 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