Hello: I am assuming this is a rent regulated apartment and the question will be what rights do you have in remaining in the premises. More...

Hello: Yes he can try and lien. This dispute will be settled or litigated.

Hello: Obtain a stay away order from Family Court and then get ready for custody/parenting/support proceedings.

Hello: You can start here: https://beta.ada.gov/file-a-complaint/ Or retain counsel.

Hello: It would appear you were hired as an independent contractor so litigation may be your only approach.

Hello: Whoever signs the lease as a tenant is jointly and severally liable to the landlord for rent.

Hello: If there is a written agreement your center has, I would suggest you modify it to include the no refund provision.

Hello: This is not an emergency for landlord to enter without notice. I assume you may want to consider calling the police the next time it...

Hello: Landlord can seek eviction against tenant and all occupants.

Hello: Yes, in small claims a party can seek a money judgment for breach of your oral "joint venture business agreement".