There is also that provision of what if I think its like if all or but just one of the units is empty (I forget the exact nature or term, but it can be restrictive).Its this a purchase or refi?

I use Urine Gone, but I'm told Natures Miracle does a good job too.

--but that's the nature of the game.

Appreciate the heads up on the Houston market natural disasters.

I picked one of the $850 ones, naturally.

A lot of times even if you can get the smell out it will leave permanent dark spots so you'll need to use a dark stain instead of natural wood.

Deposit insurance, credit building and on time rent payment rewards (Through Second Nature)What customer service programs do you have in place?

Quote from @Bill Brandt: thanks for the clarification, the parcels being sold are "better than average" the parcels being sold are on a private lane,  with mountain views,  have natural gas,  electric, fiber internet, and cell phone service available. 

Fifth, elements outside your planning or control can increase expenses significantly; tax increases due to budgetary shortfalls, insurance costs doubling due to natural disasters, tenant damage beyond what the security deposit will cover.  

Certain types of glue can outgass smell like natural gas for weeks causing nauseating and vocal complaints.