The only way around discrimination in regards to a lease clause such as late fees is to remove it from your lease if it is not to be uniformly enforced.

Uniform Commercial Code. 

And of course fair housing is pretty uniform.

Ask them what version of the Uniform Fire Code (UFC) has been adopted in said jurisdiction.

I'm not an attorney, but would direct you to Sections 47-8-1 through 47-8-51 [47-8-52] of NMSA 1978 also known as the "Uniform Owner-Resident Relations Act". 

The low hanging fruit is new uniform signage, parking lot sealing/striping and upgrading exterior lighting.  

Make your rent rate decision based on the market and be uniform in your policy.

If you use a management LLC for a land trust, you run the potential risk of violating some provision of the Uniform Trust Code if you do not use proper compliance techniques.

Typically at this stage the construction official / AHJ (Authority having Jurisdiction) will review your plans to make sure you fare in compliance with the State of NJ building renovation code called the UCC (Uniform Construction Code).

As you may know, if you get it directly from each county each one provides it in different formats, which can be very hard to go through and make uniform.