U.S. building codes specify a uniform live load of 40 pounds per square foot (psf) for most residential floor designs.

And when it comes to HVAC , they will deny and still charge you $80+ per pound of Freon .

Such as no dog over 20 pounds adult weight.

At some point, your tenant may no longer consider you a friend and your frequent visits may become unwanted.)Not getting it in writing.

Now there are features and benefits that need to be accounted for when placing a value on the property, and also the price per pound discount for buying larger units, but at the end of the day you can use the small "units" to get an idea of economic value (average price per unit based on CAP) for the larger building you are looking at rehabbing.

Do I now allow her to stay without a lease for an extra 1.5 months or do I tell her to pound sand, rerent it for more, and move on? 

Admittedly, I stopped reading this thread several posts back .... but personally, I would tell the tenant " to go pound sand!

So,sarcasm which is what it sounds like in your responses is unwanted!

After pounding the payment,negotiating with owners and being told "NO, Not interested"100 times, On the 101st time we got a motivated seller.

Thus, they can tell you to go pound sand.