@Serge S.Well Serge, I guess I should extend the offer to you as well.

., it will be hard for the tenant to prevail and or prove any problem was bad enough to prevail in court, especially if the tenant to chose to stay once I granted a release on the lease agreement. 

I've signed a lease with her for 36 months with two options to extend it another 12 months, twice.  

Closing has been extended another 10 days. 

I want to sell one of them but since they are under the same mortgage I have to get the lender to agree to a partial release.

Although if you have them financed under one loan then you would need to have the lender agree to release them individually to do that.

There should be a template form somewhere that just releases the second tenant from the lease.

From an investor point of view, cash buyer would tie up capital for an extended period of time while they deal with their 'involuntary partner' co-owner.

By taking a smaller loan balance than your original mortgage amount for a new 30 year term, you reduce your payments and extend your time in debt.  

Don't give too much extended time or favors.