First this was a BIG HINT that you should Immediately cut all expenses and save money for a Lawyer.
Yes a landlord can try and evict for personal use, but he has to give you notice of i think at least 120 days before your lease ends.
And he must live in the aprtment for 3 years as his permenant residence. or else you would be entitled to sue for it back at the last rent you were paying.
But this is where it gets expensive and detective work is important.....it must be his permenat full time residence, so you have to see f he lives else where, or sends his kids t a scholl thats not in your school district, did he change all his addresses to this aprtment, did he pay nyc taxes and vote here......
And if he is a corporation , he cannot evict you. Lots and Lots of questions that need answers if you wanted to fight this....