One where unique codes can be created for specific vendors and ideally, created and deleted remotely?

I’m only interested in multifamily in certain zip codes.

This is tricky in NJ with the high price of housing and property taxes, especially in towns with good school districts.If you aren't finding any duplexes, maybe look at single family houses that have the potential to turn a finished basement into a rental if it meets the code requirements. 

Since you are OK with it you pay it....It's not my responsibility to pay for people who are lazy and dumb, spent their 20's partying until 6 AM while I was in college studying or learning how to code until 6 AM so that I could have a better future.

Forget some tax code for a minute.The IRS did not follow common sense, in fact, they did the exact opposite. 

These are professionals with additional training and a stricter code of ethics.

Based on HUD Fair Market Rents, rental rates vary in every city, state, and even zip code.

They are a massive PITA to set up, the one we have now powers off after a bit of not being used, usually requires sending the print request multiple times, and they typically just stop working after a few months, giving an error code that says "I'm not going to work anymore". 

It's in the local code it needs to be anchored.

In the messages section there are canned response templates that I use as well and they allow you to edit before sending so I can just add their door code and hit send(its the icon that looks like an earmarked page).