Let me know if you have any questions for meWhat neighborhoods or zip codes in Columbus are best for appreciating SFR's that cash flow enough to pay for their own upkeep, and which attract solid tenants who stick around a good 5-7 years? 

But IF the property in question is in compliance with all code, and provides a safe and secure environment, all problems are timely addressed and corrected, and the property is maintained on a professional level, then the investor who has a large capital investment in the property should be entitled to enforce any contracts providing him with the agreed to cash flow. 

Second, the building code, IRC/IBC, defines a townhouse as zero lot line (zero setback) homes that are on their own separate parcels and share a common wall.

I have been using the BIS site, and as Llewelyn mentioned, the Dept of Finance tax code is 2 family, but no CofO from DOB to support. 

It's possible what you have done on your own isn't even to code or done correctly so you could be losing value if you haven't been careful.It's great that you took action.

Our city code requires a method of egress for 3rd Floor units.

Requiring a real estate license can potentially be a “trap” for wholesaling, as real estate licensees may in in violation of their code of conduct by way of their wholesaling activities.  

You are subject to new building codes.

But you will want to change the code for access right away as fired contractors can come back and take materials from you for other jobs.

I think if you understand the price per unit as well as the price per square foot in the zip code and nearby zip codes that will give you a good idea of the comparable market analysis approach and appraiser might use.