Shapefiles generated from NYC Open Data list of City-Owned and Leased Property, combined with MapPLUTO parcel data. If you use these, it would be stellar if you could cite NYC Open Data and me.

Manhattan
Bronx
Queens
Brooklyn
Staten Island

Obligatory: Sarah Makes Maps and Sarah Levine are not liable for any deficiencies in the completeness, accuracy, content, or fitness for any particular purpose or use of this or any public data set, or application utilizing such data set, provided by any third party.