I will use the ones I like on a consistent basis to get an overall picture although I realize none are laser-point accurate but they put you in the ballpark.As you do your reconnaissance (good battle word) I would recommend you add FreeCreditReport.com, Credit Sesame and Quizzle.com to your arsenal and do battle on low credit scores while keeping @Josh Autery with his great analogy in mind.

And because of how the building is ventilated the smell of smoke carries into the other units.

Do they smell or bite or are poisonous or what?

Did you smell odors?

You won half of the battle when you understand that there is a big distinction between someone wanting to sell a property versus someone that needs to sell a property.

People can generally smell money.

You could find yourself in a legal battle that will make the current situation look like a walk in the park.If your brother calls the Sheriff, the Sheriff will set him straight that you can't drill out locks and enter without the appropriate process and paperwork.

Usually when you attempt to collect a debt and a borrower cries foul.

I can smell sulfur and other chemicals through my vents.

So, instead of fighting the battle after the fact, I want to seek out the investing side and bring my own ideas to the table and stay in control of the design throughout the process.The best strategy I am seeing thus far is where there are 4 parties involved; the builder (GC), an architect, a CFO/Investment Broker to write the checks when all are in agreement, and the Investor being a source of cash only.