Also the layouts, are they true 2-bedrooms or is a "bonus space" counting as a 2nd bedroom that almost nobody would use as such? 

You could qualify for some safe harbors ( such as if your expenses were below 2500, you could expense it).In general, you could probably use 179 in the property going forward (after the new tax law) but using bonus depreciation  (100% depreciation) is appropriate.

And for some, I also give them a bonus 'kicker' when I sell or refi. 

The rest are bonus tools, which may land on Craigslist.

However, you don't get a "my tenant broke the lease" bonus fee, out of thin air. 

Bonus is Dubai will soon allow 100% foreign ownership of companies.   

They sometimes give density bonuses in these areas where they want to spur development.

Planning departments can condition new developments and REQUIRE a certain amount of units or homes be for low income. this becomes a negotiation you can get a density bonus for doing this in some areas.

On top of that, I am into credit card churning which means I apply for an average of one credit card per month to get the sign-up bonus.

To get them done per you schedule did you offer cash bonus?