The NW asking price is sufficient to determine NW's opinion of the potential value of the ARV comps (safe to assume it is north of the asking price at least a little).

However given today rates and even if the Fed lower rates by 0.5% max that would not be sufficient enough for me. 

I don't think it's swappable but a locksmith could change it out, if needed.I agree with changing the batteries, but once every two years is sufficient.

It may not pass that self sufficiency test. 

.-  excellent  point and  reminder  about what is called the FHA self sufficiency test 

The income will probably not be sufficient to live on so I would recommend you pick up another full-time job.  

In addition, the owner of the home must not own more than three single-family homes.They are unable to provide sufficient documentation, such as the emotional support animal letter, that verifies the ESA is necessary for their health and well-being.

If you are going to use an FHA loan, it will be important to remember the rules of FHA's Self-Sufficiency Test (SST).

.-  Your unit revenue and quantity has to be sufficient to offset the "costs" your putting in. 

Not to mention, FHA has a self-sufficiency test you must pass on a 3-4 unit.