If one were to do a cost segregation study with a plan to get some bonus depreciation.

@James Maradits I could see the new POS regulations as a bonus for an investor in a way.

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?