As it relates to lease end dates I've seen two things work here. 1) You can stagger end dates as mentioned above or 2) you can optimize for summer - this works better for us in areas where you see students or families with school age children moving to align with the summmer months.Separately, this is a great argument against month-to-month leases.  

All rents you get from this property has to go back into the SDIRA but if you get a 20 year mortgage (that the rent can cover) and can pay the rental off by age 65 you will have turned that $90K into several hundred thousand’s of paid off real estate.

Also, I am thinking of investing into real estate via a new Self Directed Roth Solo 401K account due to tax free distributions after age 59 1/2 instead of SEP IRA, any thoughts? 

I was thinking Stamford at first, but the projected rents seem low for the area.I have one comment on the financing, you mentioned a 30-year amortization but then also mentioned interest only, which one is it?

I fund land flippers in all these states and at your age I would be hunting down a parcel now U want to eventually move to...

You mentioned gross rents of $3400 per month and Principle/Interest/Tax/Insurance of $2500 per month. 

As already mentioned, you could sell via seller financing to lower AGI, as all you would have to claim is the payment income - until balloon payment received.Did know an investor that had 14 properties paid off and he moved into one every two years to then sell with the $250k single exemption.

In Reno and metro areas, insurance companies primarily focus on roofs, the age of the building, wiring updates, and water pipes, as mentioned @Cameron Moore.

The condo will limit the rental options to age restrictions. 

First off congrats for looking into this realy estate stuff at such an early age!