Check out the following sites:
NYC Zoning Handbook: Table of Contents
http://www.tenant.net/Other_Laws/zoning/zontoc.html
NEW YORK CITY DEPARTMENT OF CITY PLANNING
http://www.nyc.gov/html/dcp/home.html
HPD
http://www.nyc.gov/html/hpd/home.html
Or maybe you can call Brooklyn Zoning Dept. and ask directly.