I own 64% and he owns 36%.The original mortgage was for $1.5M, but we did a refinance cash out (interestonly this time with the same mortgage payments as previous) and took $1M out last year.For argument purposes, let's say net sales proceeds are $7.5M, and our equityafter mortgage close out is $5M. 

.- Other than google searching comparable rentals, is there any way you all accurately project rents as well as vacancies for your areas?

A truly self-directed Solo 401k plan would be more advantageous compared to self-directed IRA (one of the benefits is the ability to contribute 10 time more than into an IRA up to $55,000/yr, again from earned self-employment income only), however it is not for everyone.

Many areas have home stead exemptions that can significantly lower the rate. so what current owner is paying may not be what you will be paying.Also what is the valuation the taxes were figured against compared to new sales price. those taxes could raise significantlyYour insure estimate would be extremely low compared to my area in Georgia.

3)  What good information material would you recommend to compare all the markets state to state?

Its currently occupied and the rent being charged is way lower than comparable houses in the area.

Curious - what's the best way to compare rates for jumbo loans?

It should use the name and TIN of the single member owner for federal tax purposes.

My wife is a high-end residential interior designer (Projects  $1million and up) and the esthetic you have in this house is comparable to her style of design. 

Basically your IRA can buy a piece of real estate and as long as it its used exclusively for investment purposes, your IRA would receive all rental income to grow your IRA.I would be happy to connect and answer any questions you may have.