There were 5,747 single family homes (or 30.8% of the total) out of a total of 18,631 inhabited buildings.  There were 7,642 multi-family buildings (41.0%), along with 4,093 multi-purpose buildings that were mostly used for housing (22.0%) and 1,149 other use buildings (commercial or industrial) that also had some housing (6.2%).  Of the single family homes 1090 were built before 1919, while 65 were built between 1990 and 2000. The greatest number of single family homes (3,474) were built between 1919 and 1945.
Question: How many more multi-family buildings were there than multi-purpose buildings?
Answer: 3549