And I have to agree with @Levi T., the dignity of a job is a wonderful opportunity to provide for someone. 

You may find an enterprising one trying to build their business who will work and show on the weekends, but the expectations are not the same as for residential real estate.

What does the BP brain trust think about how this new tax bill in its current or expected form will affect us? 

Expect nothing and you won't be disappointed.

How much cashflow would you expect to make it worthwhile? 

With values on the rise and interest rates expected to go up it could cost you quite a bit to wait to find a perfect deal. 

Unless you expect steep appreciation negative cash flow in investment properties is cash flow prohibitive.

I expect a price drop by December 2018 to July 2019.When 4 to 10 unit multifamilies become easily available for say 150k or less then maybe we will invest in Kalamazoo again.It is a very decent market when priced right but you have to buy at very low prices to compensate for the low rental rates.  

Can always expect minor expenses though.

But the benefit of the increased risk may be that t keeps away other more risk averse investors.