Tax/Trust Question in California (Proposition 13)

[Mark McManus]

To whom tax attorney's or CPA's... 

Would it be more advantageous to purchase a home in California from my grandmother and therefore she add me to on title; or wait till she passes (she is 99 yrs old) and then simply buy the home from the executor (my aunt) outright at full price?  Prices are declining but interest rates are going up. Also, the current property tax on this property is $800/annually and if I buy it outright from my aunt, the annual property tax will increase to $1200/monthly. Also, note how Proposition 13 might be a factor in determining best option.

This question stems from me wanting to buy now however what are the other pro's/con's to this?