The "purely code" stables, I wouldn't suggest.

Although many properties with a specific zoning code are technically eligible, they would be subject to an extensive waitlist that could last years.

I had an electrician run wires in an attic, telling me up front that the house won't be up to codes, he's only doing the one or two things I asked.

There is not going to be more landed added (but may be some land lost).Good luck I compare your San Diego zip code 92154 and his Miami zip code, the most differences is sale-to-list ratio that's trending up in Miami zip code with 5:1 ratio.

So, create status codes for both of these and a few in-between codes to help you work smarter, not harder.

Just off the top of my head, I wouldn't feel super comfortable with non-US properties because properties in the US are held to HUD code (at a minimum).

But we can only assume since you stated this does not have to be disclosed because the work has been repaired, that you have confirmed the reapirs were done properly and in acccordance with any and all codes. 

Those effected go well beyond the property owners, the economic contribution of RE and subsequent economic loss in the form of: management, maintenance, landscaping, caretaking, hospitality, tourism, contracting, designing, pools and gardening is economically catastrophic and will reverberate well beyond specific zip codes.

Maybe also include City and Zip Code as columns in the sheet. 

Usually I use smartlocks, but for this type of volume, I'm thinking more typical locks that have a set of codes.