Assume you can increase the income to $100,000 and expenses will be $20,000.Is this even worth looking at? 

The best way to save on taxes and increase net worth would be to keep buying or when rates fall possibly 1031 up to larger properties with more doors.

@Courtney Olson I did this for my candle business but it could work for real estateMaybe offer Step Up  Payments too, as long as the number works, and hint at it helping wiht inflation and maybe combined it with an interest rate that is above typical inflation.A combo of something like 4% inflation to keep your same spending power as the years go, and we increase the payment by $25/month every 12 months so your spending power stays the same and you get a bit of a raise every year, then we could do a balloon payment in 10 years to settle the rest.Something like that could be an option. 

With a lack of housing, and increasing demand, I'll keep buying in Sacramento until it doesn't make sense anymore. 

It increases cost for what actual benefit? 

For example, people generally will only bid 80% on a property market value, and it just so happens that the Taxable value is around 80% of market value because Taxable Value lags behind market value in an increasing market.

Most of mine have infinite ROI, but I have 3 that for various reasons were not  refinanced to extract my investment (one had no value add, the other 2 have not been refinanced to extract the over $1m value increase due to rate increases). 

@Angel M.I understand that the benefits of the self-directed Solo 401k plan are attractive to you, but again: you must have legitimate business or self-employment activity to justify creation of the plan.

The CF only increases if the bonus attic and rooms in the basement would be rented out.

Rent one side of the home by the room, STR, MTR, build an additional room to increase rent, store an RV in the backyard, etc.