I think paying off your primary makes sense if you are close to retirement, but not if you’re young, and not if you have a sub 6% interest-rate. 

The cost segregation studies that typically yield the highest credits and deduction are for properties valued at $150,000 or more or that have lots of added features such as components to operate or high-end custom finishes.

Do not get stuck with sub par returns.

Overall, the setup and funding process was extremely straight-forward and the customer service was great.  

Low-dollar property (sub $200k). 6-unit multifamily.

It was a big alternative church property you know mind benders. one parcel in the middle of their campus 20 acres. they acquired from an owner sub too the back taxs and they never paid 1/2 of one years tax's prior to coming into title..

If you sub these out you will be wiping huge chunks of your annual NOI.  

Here is a list of Construction, Rehabbing & Generic PM softwares that may be a good solution:Construction, Remodeling & House Flipping Specific PM Softwares BuilderTrend/Co-Construct - Home building project management software specifically built for custom home builders.

The one to four is a very comprehensive contract that covers everything and even has room for special provisions when something out of the ordinary needs to be spelled out.When doing not so normal purchases like a sub-to, I dont use the TREC, but one that I created from several other contracts.

I'd never enter into a sub-to agreement unless I was the one making the payments.