Have fantasies about sticking it to your LL?

http://www.nyc.gov/html/dof/html/property/property_tax_reduc_j_51.shtml

This will get you to a page where you can search for your building. It's kinda busy right now.

I love the part about triple damages.

If you are under an unregulated lease and your Landlord has benefited from the J 51 tax abatement, basically passing on improvements in order to get the base rent over $2000, than it may apply to you. Improvements in the apartment may not be evident. Maybe he replaced an old boiler or something like that. I'm not entirely sure.