But to @Seattle Eltons earlier point (PG 1), the combined LOC (business or HELOC) can be used to purchase deals right on the spot without having to seek out other investors or private capital.

I do quite a few in PG County.

Baltimore or PG county are doable.

There are going to lend you at probably 80% LTC (loan to cost) rather than 90% in PG or DC.

I'll admit to not reading most of the 11 pg thread but you mentioned 70% all in would be a home run.

If you are looking to wholesale, Id suggest PG county and DC east of the park.

Many homes in the Seattle area are getting 50-60 offers and buyers are getting sweet-talked into paying $300k+ above asking price and waiving all contingencies after spending a 15 minute time window at the house, because all the slots to view the home get booked up and there isn't an opportunity to even do a pre-inspection even if the buyer wanted to. 

Thanks for the advice, I'm going to reach out to the county auditor for any permits.The vent is just a 14' x 6' inch slotted vent.

I'd charge ~$1000 a slot for Jan-May (8-10 people), then short term the rest of the time.I wouldn't self manage, so I get the point on unique, well designed, charming places being a priority.

Most of clients purchase in or near DC  - DC, PG County and Montgomery County.