However, I have enjoyed greatly,  the increased rents over time.  

Increased curb appeal in addition to the inside rehab.

Alternatively, you could continue to hold and rent them out assuming that they are cash flowing well and either do a cash-out refi (preferable for your next buy/hold) or a Heloc (preferable for fix/flip or value add purchase) and utilize some of the equity to increase your holdings.

https://www.cleveland.com/datacentral/2019/05/april-home-prices-up-in-both-cuyahoga-county-suburbs-and-cleveland.html so when median prices increase $30k in a couple months, it leads me to think the current pricing is artificial.do you agree or do you think these prices will hold up?

My properties are mostly in a pretty attractive bedroom county of both the San Jose and San Francisco metro areas where the underlying growth just never seems to stagnate, my managers carry 95% of the work load (I set annual rate increases, approve major repairs and do the taxes) and my cash flow on my original cost is about 10%. 

A little rent increase and a little expense efficiency goes a long way towards overall value.Also keep in mind SB 608 and how it will change financing coming up.

250,000$ building for sale with Postal office paying 12k a year in lease (65% NNN) through 2022 with option to extend at 12,650$ lease increase.

It's a goal that never ends, unlike having a set $ # goal.It treats increasing assets & decreasing debts more equally & it's not overly aggressive which could encourage over leveraging & return chasing.I know hitting this goal at a minimum, when dealing with large numbers, over 20-30-40 years will get me well past a defined/limited FI number needed for "standard" retirement. 

Increased values come from increased demand. 

Lastly, this property cash flows amazingly given the under-market purchase price and material increases in rents I’ve been able to push through.