The tax is known as UDFI and is discussed at length here on BP.  

Show them that the investment is like this:Term: Length of time before the loan has to be paid in fullAmortization: The amount you pay each month is the same as if you were paying the loan off in 30 yearsInterest rate: The annual return they will get over the life of the loanPayment period: How often you are going to send them a check with a principal and interest paymentCollateral: What the lenders get to take if you do not pay your loanThen you give an example of what they can expect to receive like the one below.Principal: $50,000.00Interest rate: 5%Term: 5 yearsAmortization: 30 YearsPayment period: Monthly, $268.41 for 60 months, balloon at 61 months of $45,991.15Total interest: $12,210.32Collateral: 123 Main Street, Small Town, OhioThese loan terms are all negotiable and it is up to you work with your potential investors to tailor a deal that makes you both money.Hope this gives you some ideas,Allen Fletcher

What lengths should we go regarding renovating to rent vs renovating to sell?

In terms of length, weekly/monthly rentals maybe treated differently when compared to yearly leases, things such as security deposit, notices, fees and Tenant's rights may be affected depending on the length.

He can also add value in a lot of other ways (all of which he discusses at length in his podcast, articles, etc.)

length of amortization?  

We kept the same term length.

Never sign an agreement holding you for length of time.

The sagging ridge line is likely due to removal of a horizontal structural cross-tie of some kind, such as a collar tie or ceiling joist with purlins.2) As you walk around the exterior of the house, stop at each corner and look down the length of the wall with your face a few inches from the surface, searching for any areas that are bowing inward or outward.3) Look for exterior wall cracks, especially ones that have opened more than 1/8”, cracks emanating from the corners of windows and doors, cracks that have one side higher than the other, and ones that show signs of having been repaired but have opened again.

No surprise, we ended up with a couple issues and no  way we'll be able to close before year's end so I'd like to consider selling the property mid-project to someone who knows and trusts me so I can still show profit this year and new buyer will basically finish the project/transaction early next year.Of course, I realize there will be some buyer and seller costs but I think those will be worth spending if we can avoid a big hit on our DTI.My question is if there are any "arm's length" guidelines/regulations with regards to this type of a transaction if there are no loans involved.