Sure, they may be able to grow to a very moderate size,  add a few units, or trade up to a larger investment, but as for real scalability: NO.Why?  

I am a little weary since I haven't done that before- not sure it would be enough to get me into buying portfolios or larger complexes though.. 

800K in renovations roughly 8K a door What was the outcome?

As you are finding out, it is so local that the next door building effects your investment. 

@Mickey Petersen I would 1031 exchange into a larger better cash flowing property or whatever gives you a leg up on your wealth building.

Hey there is someone in the house, maybe I should knock on the door and ask them a few questions...like are they planning to sell the tennis court? 

If it's a larger organization, feel free to inquire about their different staff qualifications.2.

I toured the property when they were home and they asked me how the living situation was gonna work, which I explained that my loan said that I had to live on the property for a year, and the tenant next door was on a year lease & he was month to month... so he was going to have to leave.

Investment Info:Office Space commercial investment investment. 100's of completed projects, JC Beal Construction is nearly 100 years in business, Beal Properties manages well over 2000 doors all throughout Michigan and the Toledo, OH area.

For C/C- neighborhoods you usually need to scale to 10+ doors; it's a numbers game.