You will probably find them to be lower than sales price.This can of course change at any time if Philly undergoes a change in their assessment process, which is frankly overdue. 

@Jon Schwartz1) To begin with 3 million FMV in California captures innumerable small business owners standing entirely on its own, but if that weren't bad enough, the valuation standard is actually aggregated across all properties owned so it's not in fact in excess of 3 million per property making it much worse still.2) Commercial properties have a very suspiciously expansive scope in the initiative (the devil is in the details, as is typical, and here as well) thus capturing both mom and pop businesses and in many cases even agriculture.3) Unsurprisingly those proffering the provision have acknowledged it is but a first step, once they get their foot in the door with passage of the initiative they will shoot for full repeal of Prop 13 targeting all real estate owners.4) But you make a really great point, sell it as tax on fat cats (while in reality it's scope will hit many many small businesses) makes it palatable to a largely uninformed electorate and further softens them up for delivery of the really big hammer when they shoot for full repeal of Prop 13.

So this is a longer topic but let me give my quick thoughts on 'fat' and overhead in a property management setup:You absolutely need property managers and maintenance.  

I am headed for fat FI, so I can do everything I want.

By limiting middle fat.

By limiting middle fat.

By limiting middle fat.

@Lee Scarlett There is no basis for a legal fight....the mom already signed the deed (the fat lady has sung), the son just has delusions/dreams of doing something with it which will never happen.  

I recommend a Post Compliance Lead Determination (PCAD) every 5 years or so.Here's the law (emphasis added by me):460.100: Duty of Owner(s) of Residential Premises (B) Whenever any residential premises containing dangerous levels of lead in paint, plaster or other accessible structural material undergoes a change of ownership and as a result a child younger than six years old will become or will continue to be a resident therein, the new owner shall have 90 days after becoming the owner to obtain a Letter of Full Compliance or a Letter of Interim Control, except that if a child younger than six years old who is lead poisoned resides therein, the owner shall not be eligible for interim control, unless the Director grants a waiver pursuant to 105 CMR 460.100(A)(3).

If you delead, and maintain the standard, you will be in the clear.Here's the law (emphasis added by me):460.100: Duty of Owner(s) of Residential Premises (B) Whenever any residential premises containing dangerous levels of lead in paint, plaster or other accessible structural material undergoes a change of ownership and as a result a child younger than six years old will become or will continue to be a resident therein, the new owner shall have 90 days after becoming the owner to obtain a Letter of Full Compliance or a Letter of Interim Control, except that if a child younger than six years old who is lead poisoned resides therein, the owner shall not be eligible for interim control, unless the Director grants a waiver pursuant to 105 CMR 460.100(A)(3).