The New York City Department of Design and Construction (commonly referred to as DDC, "Dee Dee See") is "building for you." https://www1.nyc.gov/site/ddc/about/about-ddc.page

Open Data Portal

This is a non-spatial listing of active public buildings projects.

https://data.cityofnewyork.us/Housing-Development/Active-Projects-Public-Buildings/g9ub-hrve

ArcGIS REST Services

As of winter 2020 the Department of Design and Construction publishes ArcGIS REST data services here:

https://dservices.arcgis.com/v09SvJE7IY8GgvSx/arcgis/services/DDC_ACTIVEPROJECTS_PUBLIC/WFSServer?service=wfs&request=getcapabilities