@Josue VargasThe majority of people, especially those who rent houses, feel threatened by books and make it a habit not to read.

One thing is to see it in charts another is in person.On my first trip I spend hours driving around and zoned in a neighborhood University area at the time I saw monorail to downtown was being build in that area and knew it would only increase the value of properties.I like being close to major Hospitals/ Universities feel there will always be a demand even during a recession

Because of that, the majority of people here prefer detached lifestyle (SFR) except in the luxury apartment and condo market downtown.

If they fill your units, they probably wont leave until the lease is up... because frankly any science major at A&M, Texas Tech, or UT doesn't have time for anything else but school.

Make sure you call their department and get these information in written. 

I could simply frame a door opening between the 2 units if I wanted.I suspect in your case you would take your best guess at which local building department has jurisdiction. 

Interiors of the homes are unknown (fire department boarded up the doors and windows to each home).

It is pulling out the money that you previously put in.Once you're at a point where your money is recovered, and you have profits over and above - you're free to do anything with this money, probably in this order:keep a reserve for contingencies (vacancy, major repairs etc.)reinvest into buying more propertieswhat you call paying yourselfYes, it is arbitrary.

Student loans are a major issue3.

We fixed the major things (mold, replaced carpets and flooring, painted everything, fixed the sunroom etc.)