They'll want all the money spent on the main house, lenders kind of ignore ADUs it's weird. 

Definitely install backup flaps and valves for all floor drains and the main line.

Airy closer to Germantown Ave, the more north the better (19119)Garden Court (19143), Cedar Park (19143), Walnut Hill (19139)B: New construction going on but mainly as multis, few SF build and sell, most action are in flips rehabs, no bars or restaurants yet.

My main goal is to find something relatively close to the DMV area but without the DMV price tag.

The money that you end up owing to repay the loan over the 5 year term is now post income tax money unlike how you traditionally are supplying your 401k with pre-tax money.  

Properties are sitting on market for a bit longer now that supply is slowly creeping back up. 50 days isn't too terrible compared to the greater PHX area. 

Limited inventory typically drives up prices for both rent and equity, as high demand meets low supply.

We then moved to a different state (from Arizona to California) but we knew it would be temporary so we kept our house in Arizona and we rented out the main house as well.  

This is mainly how we find buyers to offload our learnkey properties too.

And a lot of old school GCs may not have the ability to take a CC and may not care to learn how to...Main question is: why do you want to do this?