The reason behind that is simple: maintaining infrastructure for low density single family housing is cost prohibitive. 

Under the Fair Housing Ammendments Act of 1988, Emotional Support Animals are protected under the class of Disability.Whether the ESA is legitimate or not is a completely different question.But if they've been there for 5 years and they are a good tenant, then who cares?

With that being said, as long as your return is fairly straight forward, you should be okay but if you have multiple rentals and other things going on, always worth at least a chat with someone.

It was a fair response until the last sentence about shooting him a message.

Pricing Strategy: In a declining market, offer slightly below fair market value to ensure room for negotiation.7.

This will help you determine the property's fair market value and ensure you're not overpaying.

First time posting, my wife and I are fairly new investors.

Tenant risk is lease term remaining, sales/billings from the location, overall financial health of the tenant (i.e. solo practitioner with this one center as their sole source of income and declining billings, will not likely keep the property well maintained, and when they move out, you will have work to do), need for this use and/or competitive urgent cares in area, etc. 

The important points often glossed over are (1) is the buyer providing their personal guarantee to the seller for the note (2) is the seller maintaining a wrap position so they can foreclose in the event of default and gain ownership (3) is the buyer putting up additional collateral (4) how large is the down payment (5) what is the LTV (6) is this a personal residence for the seller or investment property (7) will the property cash flow and if so what will the cash flow be (8) is the property in a increasing, declining, or stabilized area (9) is the property being sold at market value, or above market value because of the low interest rate of the existing mortgage and (10) how experienced and what is the track record of the buyer, and is the buyer purchasing a property for investment or to live in or otherwise use.  

Many people maintain property they own differently from property they rent.