Best way to invest - remodel existing or look for new?

[Marty Houghton]

Hi guys!  Can you give me some insight?

I inherited a rental a few years ago, so the ROI is infinity (!) i have the opportunity to turn a garage into another unit, but I'm not sure if this is the best plan from an ROI perspective. If I take out a mortgage, my return goes down. Does it matter? Should I leave well enough alone and look for something else to buy?

Thanks :)