As I'm new to this domain, I would to hire a consultant to perform some zoning and other due diligence activities.

This is not tax or legal advice, just what I personally do, consult your professionals! 

Therefore, it is advisable for the client to consult with their CPA to receive personalized guidance tailored to their unique financial situation.

For example, for my out of state clients, I make sure to consult with them on their deal analysis and #s, I educate them on the good/bad neighborhoods, I help them develop a scope of work and estimate renovations, I set them up with my PM/GC/lenders/etc.

I can tell from your questions that you are in a bit over your head and before you make an incorrect decision you should STRONGLY consider a consultation with someone.

Consult with competent legal counsel to guide you regardless of your choice here.

Maybe the section 8 person can help advise you, but I'm certain they will give a disclaimer with anything they say that you still need to consult your own lawyer or read the rules.

In that case, you’d typically need to file a legal challenge, which could involve going to court and showing that the restriction is unnecessary or unreasonable.The best advice I can give would be to consult a real estate attorney to understand your specific situation and options.

I encourage you to consult with a qualified attorney to ensure this agreement complies with applicable laws in your area.

Make sure any lease agreement you use complies with Arizona's landlord-tenant laws, including required disclosures (like bed bug information, for example).If you're unsure, consulting with a local real estate attorney to review the agreement can provide peace of mind and ensure you're fully protected.