Jeremy,You have more than one option by using a Heloc, Heloan, unsecured LOC or I/O refinance. 

Dont be afraid of I/O or DSCR loans.

Like Michael said, there are apps that do this very well for both iOS and Android.

The ones getting hurt are the one that used an ARM with high LTV instead of fixed or I/O for 3 years and now have to refi or sell because a balloon payment is nearing.

If I were in your situation I'd give that a try, and if it doesn't work, like others have said already, you're gonna have to replace the carpet and pad as the urine has probably soaked through

Hi Zachary, there are a ton of lenders/brokers that have I/O options for investment properties.

I'm wondering if it's possible to add principal payment only for IO loan.

As a Mortgage Broker, when you hear someone say I/O (Interest Only) mortgages are bad, the very first thing you think is that you're talking to someone who doesn't know squat! 

You could just use a simple construction loan, you should have i/o throughout the construction period and just refi to perm loan when construction is done.

In the near future, I plan to add tenant screening and an iOS and Android app.I'd love to talk more, if you'd like to too.