Seller did cost seg bonus depreciation to accelerate depreciation schedule.

If you purchase The Book on Flipping Houses from the BiggerPockets book store, it comes with bonus materials.  

At Atlas Property Management, we have construction in-house which is a bonus for OOS investors. 

I found a duplex with 3BR/1Ba on the first floor and 2BR/1Ba (with a bonus finished attic that could be a BR) on the top/3rd floors.

Added bonus, I get to have a vacation home in italy....

It also came with a garage that already had a great tenant as a bonus income.

This house has a bonus room added without permit by the previous owner.

Bonus Also you can look at recently sold homes on Zillow contact the agent and see if they know any contractors in your area !

There are a lot of thing you're missing, and things you are including that don't matter or I would use as bonuses. 

I sometimes run into situations where a client expects a future capital gain, inheritance, a bonus, etc. in the future year, or years, where they know the future tax rate will be higher than the current year.