And now that the furniture is not an expense (since I’ve already purchased it) I literally just need to plop it somewhere vs pay for storage!

There's specificities for SFH, multi res, industrial, commercial, self-storage, hotels, etc.

Year 4: 4 doors (it actually ended up being storage units in a JV).

The ones I manage total to 20 bedrooms.These rooms rent for between $125 to $225 per week depending on room size and amenities in the room (beyond basic amenities may include: Desk, Tv, private entry, tenant controlled AC, additional storage).This month after padsplit takes their 14.25% cut of the revenue I am recieving, from the units I own, $15,230 from 3 homes.

Rather than spending all the money to furnish the unit for it not to be successful... and have to sell or put all the furniture in storage and create another expense. 

You can also invest in self-storage units.

I love self storage.

First decide the area(s) of interest to you as an investor - both geographically and the type of investment (SFR, small / large multi, storage, etc).

In my case, I have residential rentals in one LLC, commercial properties in another, self storage in a third, and my real estate company operates in a fourth.

That's where bad experience/nightmare come in.Lastly, to answer your question, to build a basically designed, square/rectangular house without crazy jigsaw puzzled cuts on roof, the following price is a good competitive construction only price for what you need to do:Around $165 per sq ft on conditioned space (for an average 1200 to 1800 sq ft house, 8-9ft high ceiling, everything is investor grade finishes), $90-100 per sq ft for garages/unconditioned storage, $60 per sq ft for porches/opened spaces.