The actual land use code is GOV.65852.2(f)(3). 

Something to keep in mind is that the actually county inspectors are quite versed in walking homeowners through the steps, area building codes are easily available online, and there are some very high quality contractors with YouTube channels now showing most everything.

On a month to month lease what options do I have if any to get them up to market under the strict rent stabilization ordinances?

Why not offer to split the cost with them and you hire the electrician to make sure it is done to code? 

Up to this point we've been strictly commercial.

It all depends on the location, type and size of property Fisrt step is to meet with the city to find out if there are any code issues and non-conformities.

I am buying strictly for cash flow.

By the way, these codes are local, states (sometimes), but county and even cities have different zoning codes and meaning within those codes.

Fortunately the work that was done was up to code so all we had to do was invent some drawings and pay the permit fee.   

I'll respectfully decline to further expand on it.If you want the correct answer you should be going to the code and regs, not IRS instructions, which are non-authoritative.I agree a taxpayer should work with a professional once their complexity warrants it.