I have also found out that the owner of this company has all the asset managers for the banks on "speed dial" which is preventing everyone else from gaining access to these properties. 

Would anybody can give me advise what should I do to prevent Defaulting.

@Alicia ShafferWhat exactly is the issue that's preventing you from closing with your title company?

An individual was the winning bidder and they also paid the back taxes to prevent a tax foreclosure. 

This was a fully gutted brand new apartment with new Sheetrock walls that had to be cut a couple feet from the now cement floor to prevent black mold and bacteria from growing.

My plumber disagrees and says I should be proactive and do the fix to prevent a larger issue in the future.Thoughts on if this is the condo board's responsibility and whether I should cover the costs for the fix?

Does anyone else know other rules that may prevent a RV renter from moving onto my property? 

Present it as an option to prevent foreclosure and help them.

I recommend two things: (1) read the lease to make sure there is not a clause the prevents assignment and (2) create an assignment of lease document and have the tenant and the owner sign it.

There's an under supply of housing here,  and nimby politics prevent development of housing at a rate that fixes the under supply.