If the Tenant refuses entry, you can terminate their lease for refusing entry.I try to give them at least 24 hours notice and I try to accommodate their schedule, within reason.

Despite our trying to accommodate them, they have been very ugly to us.

For older demographics, consider the availability of medical centers, entertainment, and restaurants.Buildings/Permits: Assess the city's growth compared to previous years.Determine if the city can accommodate future supply.Government Regulations: Examine the city's efforts and the type of businesses they are targeting.

If you have two, but only need one, I could provide accommodations in San Diego (close to Downtown) in addition to price of the ticket.

I’m 100% your ally on this one.For those tenants you believe are abusing the law regarding service animals and assistance animals, maybe the following could be of some educational or informational use to you:Joint statement of the Department of Housing and Urban Development and the Department of Justice Reasonable ACCOMMODATIONSunder the Fair Housing Act, dated May 17, 2004https://www.hud.gov/sites/dfiles/FHEO/documents/huddojstatement.pdf* See paragraphs 7, 17, and 18.Reasonable Accommodations and Modificationshttps://www.hud.gov/program_offices/fair_housing_equal_opp/reasonable_accommodations_and_modifications* General information concerning disabilitiesJoint statement of the Department of Housing and Urban Development and the Department of Justice Reasonable MODIFICATIONS under the Fair Housing Act https://www.hud.gov/sites/dfiles/FHEO/documents/reasonable_modifications_mar08.pdf* Nothing about animals, but bonus material concerning the rules for interacting with people with disabilitiesAlso, you might find this interesting:Air Noah No More?

Training tenants is the key to a happy landlord.In your case the solution is switching out all your inherited tenants and screening to accommodate your personal landlord needs. 

If the documentation provided isn't legit, and they are in violation of the lease, its a considerably small win versus being wrong or asking them to leave when the documentation provided meets the crieria for a reasonable accommodation, which is what this is.

Figure out how much you can afford to spend on a property and how much you can realistically charge for rent.Research properties: Look for properties that have separate entrances for each unit and enough space to comfortably accommodate tenants.

Do not accommodate to these renters!

A lot of the discussion for Airbnb seems to be focused on what its doing with cities that already have a high volume of rent by the night accommodations.