It seems with prices now this is the only way to get cash flow while accounting for the items mentioned above by Joe Fairless.

Between these two you can find a lot of items. 

I have a clause in my lease that says all money received is used to first pay outstanding items like fees and utilities and then money is allocated to rent.

It does however damage some materials but is worth it to get rid of smoke odors and shouldn't damage too many items.

I am getting ready to start a rehab project and I remember reading somewhere where you can take a list of your construction items to the PRO desk at both Menards and Lowes and they can send them up to corporate for re-pricing. 

Go to REIAs and when you meet folks capture and save their info.

and mort balance that is linked to a master spreadsheetLooking to see if anything else i need to capture 

(A Security Deed transfers an ownership interest to the Bank in order to Secure their interest in the property—an analogy is a car title where you and the Bank own the secured item together).

Make sure they itemize their receipts.

While you cannot benefit from equity on a purchase mortgage (you are still putting down 20% or 25%), you can capture equity by way of a rehab-to-perm process.