SB9 Rental Maxing in California

I have an opportunity to purchase a single-family house from my mother for a fantastic deal.

I'm interested in splitting the lot (ok under SB9) and building 2 units on each lot for a total of 4 units.

I'm planning on living in one of the units, and I'm estimating earning $2,000 - $4,000 in rent per unit that can cover the mortgage & other expenses and some positive cash flow per month.

Does anyone have any similar past experience with doing the SB9 split and maximizing the land for rental income?

If you had a similar opportunity, would you make the investment?