I have tenants who are nearing the end of their 6-month lease which expires July 31.They are smoking in my rental in violation of the lease agreement.They are also paying $1625 for my 2/1 SFH which is at the top end of the spectrum for rent in my neighborhood/area.What would you do?

Time to start investing North of Broad?

You're going to see answers all across the spectrum.

Someone preferably on lower-end of pricing spectrum.

Peoples needs and motivations vary a great deal, and, while very broad generalities may be valid, it is not reasonable to assume that the criteria for buying a home, renting a home, buying a car, and obtaining a credit card can all be optimally based on the same three digit number.

I do agree that tenant quality tends to improve as you go up the tiers of neighborhoods/price point but more broadly speaking I do think there are regional differences in Rental Culture of the tenants.  

(the income is called UBTI - Unrelated Business Taxable Income).Broadly speaking, Solo 401(k)s do not have to pay tax (UBIT) on UDFI, but, generally, would pay tax (UBIT) on UBTI.

I presume you need all those properties in an LLC to get one broad commercial policy that covers them all?

That is a broad statement.

CA takes a broad scope of what constitutes "doing business" in CA so either way you will be subject to the $800 minimum tax in CA.