We hope this house we are in now (new project) to be our last "live in flip" (it's very exhausting) we want to do a quicker flip,(not have to wait 2 years to sell).

If you have an exhaust fan then you can put glass block in. 

Once I have exhausted my HECOC, I will lock in the rate. 

Thanks for sharing your wisdom.Using the chimney stack depends on your city code, here in Utah if it's and aluminum vent piping for the stack it's legal to tie into it, if it's just a straight old school brick 2X3 chimney box you can't demp the water heater exhaust into it. 

Only sure fire way to get people to move is filing for eviction.There are a lot of options you can employ based on the situation before then.But it sounds like with these bums you have exhausted all those, and they have not been true to their word.Evict.

And yes, you may want to find an agent you can hand off potential "retail" sellers to once you have exhausted all the avenues of obtaining an wholesale price. 

If there are other posts that answer the majority of my questions, I apologize for not doing an exhaustive search. 

Make sure your HML has the financial resources to withstand a market crash and that they have been through it and survived multiple times before.  

You just want to make sure that there is logic to your methodology that could withstand in an audit.

I can only assume by the way you wrote the post that you have exhausted this avenue and someone may be negotiating by emotion ;) $74k is an expensive emotion....