NYC's apaprently-unreliable PLUTO data, grouped by year built for Brooklyn buildings from http://www.nyc.gov/html/dcp/html/bytes/dwn_pluto_mappluto.shtml. Houses seem to be invented in 1899? There's also a BuiltCode field that provides whether the date is an estimate or not, and according to it 19403 of the 19503 buildings from 1899 are estimates.

gistfile1.txt

NULL  0
0	12886
1800	229
1804	1
1822	3
1824	4
1825	2
1826	4
1829	20
1830	9
1831	6
1832	5
1833	1
1834	5
1835	3
1836	4
1837	2
1838	4
1839	5
1840	18
1841	5
1842	9
1843	7
1844	17
1845	15
1846	7
1847	8
1848	11
1849	17
1850	30
1851	6
1852	10
1853	8
1854	6
1855	9
1856	10
1857	4
1858	5
1859	4
1860	20
1861	1
1862	1
1863	2
1864	1
1865	3
1866	4
1867	3
1868	4
1869	6
1870	4
1872	2
1873	1
1874	2
1875	3
1876	1
1877	1
1880	20
1881	3
1882	3
1883	1
1884	3
1885	9
1886	8
1887	4
1888	4
1889	7
1890	44
1891	8
1892	5
1893	2
1894	4
1895	30
1896	2
1897	4
1898	9
1899	19503
1900	2480
1901	14890
1902	20
1903	57
1904	83
1905	5250
1906	460
1907	316
1908	169
1909	201
1910	23178
1911	231
1912	235
1913	129
1914	288
1915	5964
1916	226
1917	149
1918	72
1919	132
1920	31006
1921	639
1922	417
1923	734
1924	904
1925	28491
1926	970
1927	1298
1928	1598
1929	410
1930	29662
1931	19512
1932	357
1933	704
1934	99
1935	5934
1936	173
1937	117
1938	171
1939	156
1940	8095
1941	113
1942	36
1943	7
1944	28
1945	3767
1946	57
1947	29
1948	94
1949	100
1950	5378
1951	157
1952	118
1953	97
1954	136
1955	5242
1956	151
1957	183
1958	185
1959	190
1960	10982
1961	142
1962	175
1963	232
1964	173
1965	4056
1966	109
1967	103
1968	114
1969	101
1970	2455
1971	118
1972	145
1973	120
1974	125
1975	898
1976	71
1977	46
1978	78
1979	58
1980	545
1981	46
1982	79
1983	123
1984	206
1985	772
1986	874
1987	809
1988	400
1989	813
1990	895
1991	426
1992	637
1993	457
1994	379
1995	490
1996	524
1997	506
1998	498
1999	688
2000	952
2001	926
2002	1001
2003	1084
2004	1687
2005	1820
2006	1274
2007	1202
2008	938
2009	670
2010	256
2011	319
2012	340
2013	13