We put pad locks on our gates to prevent them from coming back in without us being there.Finally his friend contacted us about signing a lease.

Our priorities are 1- fixes for safety or to prevent further damage; 2- fixes that improve the rental income or will draw great tenants (we're turning the studio to a 1Br to increase rent), and 3-things my wife wants for customization/aesthetics (happy wife, happy life).Some specific questions I had so far are:1) We have a modified bitumen roof. 

Roommate A gave no notice (to us or the other roommates) and just bounced, Roommate B is moving back to Colorado because he got in a car accident and ended up with a concussion requiring ongoing care, which isn't covered by his insurance in Texas-a crappy situation.Roommate A has done nothing to fill his vacancy, and no one can get in touch with him.

It's preventing you from buying a deal you shouldn't.You can settle for a bad deal, look in another market where houses are cheaper, or be patient.

Is there a lien I can put on the property to prevent sale until deposit is paid?

This makes it a little easier to prevent the bank from noticing thus enforcing the due on sale clause

Why people want to prevent economic progress is more than I can understand.

I agree @Mihir Bhimaraju, I'm glad I discovered BP by accident.

Or additional lattice that may block out more of the cemetery but local restrictions may prevent such things being built too high.Such an external obsolescence will affect the ARV of the property so it must be budgeted for.

After working at a student housing complex and seeing people destroy their units by accident all the time, I highly recommend requiring it.