It requires revision of the stated principal of the loan, triggering specific rules known as OID - original issue discount.

Go look at historical numbers for any 10 year period and see what that looks like in terms of appreciation and rent increases and I'd be extremely happy with those numbers even if I was paying retail. 

They all said the their 2nd home loans, without exception, trigger a due on sale clause if the property is moved to an LLC.

This delay is costing me money every day as my property remains vacant.Additionally, their application process is extremely tedious and discouraging for prospective tenants.

The best way to deal with these things is to create policies you go by and will only bend under extreme circumstances (this is true for almost everything business, as The E-Myth discusses very well).

Pull the trigger :)

Neither of those options are extremely efficient or effective.

You need to talk with a lender about your particular scenario before pulling the trigger.

This is a bit of an extreme example.. but it is one of many that could take away your ability to rent. 

His knowledge and ability to analyze the market is extremely impressive.