Folks there is a mechanism on the DOF website for this issue. You still have to stay on top of this however.
Commercial rents in BK
The REBNY put together this preliminary report on commercial leases in Brooklyn. The main point is the recognition that Brooklyn is up and coming.
Airbnb Effect on rents
There seems to be an effect that pushes rents up. Might make sense to rent out your place if you are legally allowed to.
http://therealdeal.com/blog/2015/10/14/how-much-does-airbnb-impact-nyc-rents/
Some places have jumped in rent
Morningside Heights by where I live is booming.