block group Density
per acre		 Units
per acre		 Platted Decades
Built Up		 Primary Housing Type Neighborhood
Tract 69, Blockgroup 2 75.92 35.2 1839 1840 – 1970 apartments above retail Boerum Hill
Tract 75, Blockgroup 3 45.98 21.52 1839 1840 – 1880 single family attached Gowanus
Tract 77, Blockgroup 1 64.22 35.35 1839 1840 – 1980 single family attached Gowanus
Tract 493, Blockgroup 2 162.57 55.89 1840 1840 – 1910 apartments above retail Williamsburg
Tract 505, Blockgroup 2 105.32 37.58 1840 1840 – 1910 two to four flats Williamsburg