Series Is Presented Here As 2 Variables: (1) Original Data, 1902-1918; (2) Original Data, 1923-33. 1902-1918 Data Include Buildings "Constructed And Inspected But Not Ready For Occupancy." 1923-33 Data Include Buildings "Constructed And Inspected And Ready For Occupancy." Source: Statistiches Landesamt, Statistiches Jahrbuch Der Stadt Berlin, 1902 On.
This NBER data series m02080b appears on the NBER website in Chapter 2 at http://www.nber.org/databases/macrohistory/contents/chapter02.html.
NBER Indicator: m02080b
Release: NBER Macrohistory Database
National Bureau of Economic Research, Number of Residential Buildings Constructed and Inspected for Berlin, Germany [M02FGBDE00BERM470NNBR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/M02FGBDE00BERM470NNBR/, November 24, 2015.