LIHTC development, Section 8 focus, or just finding really inexpensive real estate and intentionally keeping rents lower than market to provide affordable housing for the area.  

Thanks Gents,I'm sure I could find a better deal somewhere else, but I'd like to invest in markets that I know which are all in CA and mostly in expensive parts of CA (San Francisco, San Diego for example). 

There is a wealth of info here.Read Avery's  book.I would also recommend Chad Carson's book "The small and mighty investor"Congrats on getting started so early.If I knew what I know now at 18...woe.Let me know how I can help.Oh I would start with some inexpensive STR'S property's maybe with owner financing to get started.

-Factor in expenses like loan interest - this may increase your target ROI.

If the rent is too low, it will come up due to demand. 2) Landlords expenses have been increasing significantly so some of this increase in expense is going to be passed onto the tenant so that the landlord can still operate a profitable business.

We have around $100,000 per year in expenses just in the various tech we use and it only get's more and more expensive as we grow our book of business.Thanks 

You can get a house for $100 per night which makes all of the houses unprofitablePlus there’s a lot of regulation limiting occupancy, etc. etc.There’s tons of houses on the market for sale right now in the Poconos at very inexpensive prices, because no one is making any money on their STR‘s so everyone has to sell.

Typically in expensive markets house hacking is favorable off the bat, cheaper markets you can rent and buy an investment property 

Does anyone have experience and want to discuss puting inexpensive prefab/modular homes (not mobile homes) on vacant lots?

There are plenty of inexpensive homes within a 20-30 minute drive of Hershey (Hershey Park, Chocolate World, Concerts) and Harrisburg (State Capital).