Using the building illegally
If you are using the building for an illegal purpose, like selling drugs or prostitution, and the landlord can prove it, then this is a valid reason for eviction. You can try to negotiate with your landlord for more time or even money to move if you are willing to your move out without conflict on the agreed-on date. It may be best to have a lawyer help you make the agreement, especially if it involves a buy-out. Get legal help here or join us at a Tenants Rights Workshop to connect to other tenants fighting eviction.
However, If you have not used the unit illegally in any way, then this is NOT a valid reason for eviction. You can write a letter to your landlord stating that the notice is not valid. Send your landlord the signed and dated letter via certified mail and keep a copy.