Homestead has partnered with Yardsworth to simplify SB 9 Lot Splits. Click here to learn more.
Your property will be smaller following the split, which causes a slight drop in home value (usually around 10% for a 60/40 split).
The lot split won't affect property taxes, although you can request to have your property reevaluated following the split to see if you'll owe less.
SB 9 does not seem to affect a property's Prop 13 status, but it will reset when a lot is sold.