In the process of buying 3 duplexes and need to know how much should I expect to spend on insurance in Texas?

Great point on setting objectIve service level expectations.

So jump in, learn, make connections and expect yourself and your 'job' to evolve.  

They tend to jave unreasonable price expectations, will not negotiate a home inspection in good faith, the property usually wont appraise because there is no listing agent involved, they wont drop the price when it doesnt appraise, they wont make lender required repairs and so on and so on.So why spend 20 hours on a transaction that is very unlikely to close?

Its hard to tell what would happen in the next 2-4 years, some markets have good fundamentals like job and population growth that would last for years to come.If this bullish cycle passes 2022 it would certainly be one of the longest "recoveries ever".In saying that, it is expected after the crises of 2008. 

We also addressed the painter living there (he handled it) and set expectations that he would replace any damaged carpet at no charge. 

Are there any good sources out there showing somewhat accurate population growth expectations for the upcoming years in the cities on this list? 

Fox 13 news gave us a look at a virtual tour Tampa released recently that gives a good idea of what Tampa could look like in 5 – 10 years, if the existing and pending projects are completed as intended.What’s Expected 10 Years from Now?

Most accurate way is to inventory any capex/maintenance items you are responsible for as opposed to hoa, then calculate expected life and replacement costs.

I do expect to have multiple properties and multiple partners down the road.