In the eyes of the law and human rights, a tenant has the right to have anyone come into their home that they authorize to do so.  

@Gabriel Miller This is very specific to your city and local housing authority.  

I once read a book about equities/commodities trading and one of the key points that the author made that seems appropriate is that there is a huge difference between speculation and gambling.  

I advised the public housing authority in Broken Arrow, OK.

You want to find out how far away any potential tax auction might be as that could be another avenue.Simply tell the seller that X is the most you can pay for the property but you are willing to negotiate with the bank on his behalf (requires his authorization to be submitted to the bank) to get them to agree to accept less.  

Call the local Housing Authority and get a copy of their utility allowance so you know how much to deduct from the above for utilities to compute what kind of room you have to raise rents (without utils.) 

The person signing the contract has to have the legal authority to sell the property.  

Our local water authority is making life a bit difficult and is delaying getting a final payout number.  

'Never Eat Alone' (not sure of author) This business is all about networking!

The local housing authority will do an initial inspection once you sign a lease with a voucher holder and then yearly inspections after but they are mostly safety issues they are looking for.