-> Sierra west-> Bad schools,builders ready to negotiate, rents are not that greatAny advices, pointers on this .Thanks

This isn’t a bad thing!

But I'm not sure what would bring rents or housing prices down significantly other than the usual - a big bad recession. 

How does one define design choices, etc?

It won't be as promising; the saturation of this thematic investing choice has defeated it's purpose.

They have the choice of finding their own insurance or they can be automatically enrolled in my master policy.

In normal times i would think selling is typically the smarter financial choice, but at the current time keeping may have a significant finance (due to low interest rate) advantage.Here is a list of why adding ADUs in my CA market is typically a poor RE investment:1) The value added by the ADU addition is often significantly less than the cost of adding the ADU.

It may not be a bad idea to also be added to a MLS search to receive any new build listings. 

Alos don't feel bad.

Brandon Turner's Rental Property Investing book is an excellent primer to understanding the happy path for purchasing a property - however in this market it really comes down to having bulletproof assumptions on rents/taxes/R&M/etc. as with rates as high as they are/inventory as low as it is, there is less cushion in your returns if you analyze properties with bad assumptions.