Also when building the property you will have the advantage of using cost segregation strategies to depreciate the value of certain models by 80% through the TCJA bonus depreciation law that was passed out. 

Even got a back porch which was bonus!

Hypothetical situation: If I am working towards material participation hours on a relatively small property in terms of total value but get there in terms of the technical hours and the test, and say later in the year I purchase multiple properties but am unable to generate material hours on those properties (ex. maybe even <10 hours), would I be able to aggregate all properties for the material participation test and thus qualify the properties bought later in the year for the benefits of bonus depreciation with a cost segregation (helping to offset my husband’s W-2 income)?

Now, it's a bonus/laundry room. 

Within  3 months the market tanked and my aviation bonus started feeding this monster.

I have a short term rental that I did a cost segregation on and am taking accelerated bonus depreciation.

My new thought is to make the basement a master bedroom, with another "bonus" room to add some square footage and be more attractive to investors.

Also, I am a California Resident so I heard I cant use Bonus Cost Segregation Depreciation for CA stage?

One aspect I am particularly interested in is taking advantage of TCJA bonus depreciation in the first year of purchase.  

Again, go back 12 months to see if there is a trend where the cost/sf goes up with the size of the property, but, once it reaches a size, it either slows down its increase/sf, or it just reaches a maximum ARV, and the sq ftg above that is just a bonus to the buyer.Market analysis is everything, and the property analysis is just a result of how it fits into that market (actually micro-market).