Preferable place those pmts in your SD IRA or better yet, a Roth for tax free growth and withdraw, for let's say, $100 good and valuable consideration.

I still have most of them and they are all occupied rentals.I am also buying with my self directed ROTH IRA to generate tax free income.

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Is there a way I can move the money from Roth IRa to a self-directed IRA with solok option for investing in real estate?

, probably best to roll out of the TSP (or leave a "$1" to keep the accoutn open in case you want to roll back in maybe) into a IRA. 

In terms of financing the first purchase, I have been debating tapping into some old 401(k) accounts from previous W-2s (companies I no longer work for but still have the investment account and haven't technically rolled it into a traditional IRA).

I do IRA but its like $5500 per month.

I just did a webinar last week for Advanta IRA on this very subject (I think it should be out by now on Youtube).

This is why I have personally steered away from this type of investment, unless it's in my 401k/IRA or something where it's basically forced on you to have a passive investment.