Unique situation

[Mark Nolan]

PLEASE SOMEONE HELP ME !!

I own the lower half of a two story property in upstate New York.

There are two separate deeds.

I'd like to sell my half, move away and get on with my life. The owner of the upstairs and his lawyer are preventing me from doing so.

I have a lawyer but she is useless.

Why should I need the other owner's permission to sell MY OWN PROPERTY ???
It's not right and I'm extremely angry !!!