Chck the links under RENT. There are a bunch of options and I would think you can get a better grip on your situation after a little research. Good luck.
I wish I had better news for you. But unfortunately, unless your lease is rent-stabilized, the landlord can raise the rent as much as he or she sees fit.
Perhaps you could try to negotiate with them? If you've been a good tenant, they may be willing to negotiate your rent in an effort to reduce turnover/vacancy.
I hope this helps! Please feel free to reach out to me directly if you have any other questions, or ultimately decide to move! I would love to lend my expertise.
Licensed Real Estate Salesperson
114 Perry Street
New York, NY 10014