In this area thats going to largely be PG county and DC.

It has been many years since I've used an coin operated washer or dryer, but they used to be able to adjust what the amount they charged by putting something in the slots. 

If it's occupied, knock on the door.If it's unoccupied, tape a letter to the door (or slip one underneath or through the mail slot if equipped.As suggested above, talk to the neighbors.Ask at the post office what they know?

Today was slotted mainly for phone work.

Average PG & E bill before the solar was less than $150 a month.  

I am not looking for a lockbox with a single code. i.e. each prospective tenant will show up at the house, after being verified,receives an their personal code which is good for that time slot of say 20 mins.

PG County, Bmore city (not county), montgomery county has some of the highest property tax.

I may write a blog post about how to survive the results of a 52 pg inspection report with a first-time, unrepresented buyer on a house that needs a roof next year, a water heater and has lead paint on backside of the facia. 

Because of this, you have just opened up 1 or more slots available for additional Fannie Mae financing.

With respect to my own reading:Q1: It seems very clear that "outstanding debt / basis = UBTI" is the proper formula.Q2: I agree with you.Q3: Pub 598 seems fairly clear that depreciation is allowed in proportion to the debt-financed portion (see pg. 18).