Just make sure to account for repairs, capex, maintenance and any management (if applicable) in your cashflow numbers.

My bank charges me interest based on prime rate plus 0.5%.

You can also charge back electricity generated from the PV and act as the utility/energy provider.

But they do not affect the application of 1031 to your property.

. $500k won't buy you much in San Fran but is a pretty healthy budget in Jax.One smaller factor is that Duval county doesn't charge impact fees on new construction (and is the only county in Florida that does not) which is great for developers but not so great when there's no money for maintaining our schools.https://www.jacksonville.com/news/20190423/duval-voters-to-decide-on-proposed-sales-tax-referendum-to-pay-for-replacing-repairing-renovating-schoolsAlso this isn't Florida or Jacksonville specific, but in times when the stock market is particularly volatile real estate investing becomes more appealing even with lower returns.Personally as an investor I find all this out-of-town investing a bit annoying (increased competition and increased prices) and am concerned that these properties potentially aren't well maintained.

Why are they charging so much???

Issues of concern are getting an ITIN, annual tax compliance including Form 1040NR, partnership withholding forms 8804/8805 if applicable, and FIRPTA if applicable.

You could always ask to review the final applicant though they may or may not go for it. 

Property management companies are asking extra charge for initial setup2.

Not an unreasonable charge in any way.