Baltimore City Eviction Question

[Robert Bodmer]

Hello BP, I currently have a property in Baltimore City where some of the tenants on the lease have left and one is remaining. The tenants that are leaving are claiming it is a toxic situation (Have not claimed domestic abuse yet). They (2 out of the three 3 on the lease) want off the lease. The third that is staying claims he has nowhere to go and also says that he will not be paying the full rent since everyone signed. He also claimed he is looking for other places to go but I have a feeling he is going to stay as long as possible paying 1/3 of the rent. 

I know all parties are still responsible for the rent payment and if I were to evict, it would be all three. But right now we can't even evict and if we could it wouldn't be that much of an incentive for the two that have left since they already have another home. I've attempted a cash for keys like scenario where I upfront the security deposit back so that the one tenant will vacate but he is not budging. 

What options do I have here?