PMI is such a dirty word but if the PMI even for a lifetime - or at least the next 10-15 years results in lower payments than I get with a refinance in the short term, should I just suck it up and keep paying it indefinitely? 

You'll keep that depreciation recapture at bay indefinitely. 

Sounds like a fine thing for carmakers to do, on average.

The end result a client wants in definitely to rent the property fast as a possible.

You could also do a 1031 exchange and indefinitely defer all the capital gains tax.

So you may want to keep that in mind when looking for your next property to live in.The remainder you can put into a 1031 exchange and use that to purchase the multiple cash flow properties out of state and defer indefinitely paying the tax on that portion of the sale.  

Team building is not a task you complete then set it and forget it, you'll be managing these people indefinitely.

We were already planning to review the deal after 5 years.If we were to hold it indefinitely, is it fair for me to keep paying the expenses?

The 1031 allows you do that and keep the tax indefinitely deferred.  

Some of my REI clients are grappling with this, and I am still of the opinion that they should still do the cost seg studies if there are large enough short-term savings and they are planning on holding the property for an indefinite amount of time, but I am curious about other views on this.