I now have 33 doors and 135 storage units.Even if you only bought one house and paid it off in 15 years, you would be age 65 with another $3,000 or more in monthly income.

I am under contract for a property at 295k for a 1977 3b2b, 1984 2b1b, a double storage shed, and a covered double car port on 4.25 acres of unrestricted land.

As to the actual construction, time can be saved by ordering materials in advance and put in storage, having multiple crews going at once and having tight timelines. 

It is not to be used for storage. 

However we would be "getting more house" ( access to a second back yard, tool shed, driveway, second storage unit, etc)When I look at other houses in the area, with the intrest rates as they are, I don't understand why anyone would buy multifamily and rent it out when all of these calculations would be negative cash flow.

Hello,We are looking to buy STR/Storage pole barn for $275,000.

Pigs get fat; hogs go to slaughter. 

I am concerned about that kind of thing, since I'm the "big-city fat-cat landlord" (so NOT!)

My W2 income is >$550k/year, if I build an RV/Boat storage facility, will my storage business expenses/losses be able to reduce my W2 taxable income? 

My self-storage facility sometimes gets 5-6 calls in a month!