What case could I have?

He broke the lease and you can sue him for triple what your damages are. That's the easy part. The hard part is just what ARE your actual damages...

What can I do with a former landlord.

There are expensive solutions, but realistically nothing that is reasonably affordable.

Is it illegal to sublet my NYC apartment to my friend for 3 months?

It is perfectly legal. However, there is a complicated procedure for this spelled out in New York Real Property Law Section 226-b, which you should...

Assuming the rent is legal, you should set the higher rate. It can benefit you greatly down the road.

Is it a crime if a relative who is not on my lease breaks/alters my apt door lock to gain entry to my apt?

This is not actually a landlord tenant question. You should be calling the District Attorney's office and asking them. That said, my GUESS would...

Trying to evict a subtenant who owes 6 minths Of delinquent debt. Though i dont have written permission to sublet.

You can still evict the tenant. However, I don't know what this 7 day notice is. That may be a detail that could somehow change my answer.

Is lease enforceable by landlord if he is not the same land lord I signed with?

Your wording is a little unclear. If you signed the lease after the property had already been transferred back, it's not a valid lease. If it was...

It would not be proper for us to quote specific fees. Your case can predictably take at least six months, but some cases go on much longer,...

You are certainly on the correct path. With the assistance of a competent attorney, you can lock in your rights in cement. The failure to include...

Generally speaking, yes, you can be evicted. The fact that you paid her is not a good enough defense. That said, yes, there are special laws...