I'm 19 and about to buy my first 2-4 unit apartment but haven't yet, however if I could of went back a few years with everything I've learned now just make sure you're always learning, reading, etc, don't spend your money on stupid things like cars and clothes, if you get a job and keep saving you should have money for a 5% down payment on a property by 18 or so, if you're going to college you can buy a 2-4 unit (duplex-4 plex) or a cheap house and rent out the other rooms, that can go in general too not just with college, and don't buy a brand new car, get at least 3 years old because a car loses 40 percent of its value over those years, you can get a very low mileage older car if you hunt for it, new cars are financial suicide to young people, ideally don't spend more than 10% of your income a vehicle per year, that may be hard depending on what you do, and invest every penny you can while maintaining a safety net (at least a couple thousand dollars to cover expenses, etc) that way you don't have to pay abhorrent credit card interest rates.etc

Safety.

As soon as you can comfortably change the exterior door locks for safety reasons.  

Some safety basics: Keep a safe distance between the grill and the building.

If you mean the mortgage underwrite, it needs to be a complete and functional home with no apparent health or safety issues.The bathrooms can be old, nasty, and gross, but they must be complete and functional. 

As stated earlier you can also get the legal description from a previous deed, which should match the title commitment.My deed references a vendor’s lien so that’s what I use.I don't believe referencing a vendor’s lien in the deed is crucial, especially on a "friendly" loan, but for a third party loan from a traditional lender it is a separate safety precaution to clearly show on the deed.

@Jeff Stith,Appreciate your service to law enforcement and our safety!!!

BEFORE my safety net of 10% income, it looks like I should get a ROI of 15% which I really liked but now after the safety net it is closer to 3% and no longer looks like a good deal.

This would make you liable for fire safety, since you can't (at least in Texas) have a double keyed-deadbolt on an exit door. 

Where this also helps compared with mobile homes is most of our homes need to be 15' apart for fire safety, whereas I would imagine these could have a 0' offset.