Not sure I'd ever hold RE in an IRA but sounds like a strong deal if...you will own it. 

There are some private lenders (that have no credit background) trying to offer this out of their IRAs and such.

@Andy C.A few other considerations:1. construction loan might be difficult if you are doing a prefabbed ADU2. have you considered financing part of this through borrowing from your 401k/IRA account? 

A lender may require that you pay that off anyway to qualify for a loan.Once you have the 3-6 mo. emergency fund and paid off high interest debt, I'd personally probably be looking at paying off any moderate interest debt (4-5%+), opening an IRA, and setting aside a portion of what's left of the $100k to make max contributions for at least the next few years until I knew I could set aside enough income from my job yearly to make the contributions myself.

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.

A lot of forum members are very knowledgeable in their respective fields related to real estate investing, whether that is real estate sales, wholesaling, flipping, rentals, lending, self-directed IRA and Solo 401k investing, or tax and legal guidance.Discounts on some products and services are offered to BP members: https://www.biggerpockets.com/perks/proIf you haven’t been to it already, you might want to check out the BP blog: https://www.biggerpockets.com/renewsblog/The site has quite a few tools that can be helpful for new members.

. $99.95 download for long term rental Cash Flow Analyzer Pro or $129.95 download with IRA module (tax advantage analysis for putting real estate into IRA, Roth & 401K)$99.95 for Flipper Cash Flow AnalyzerValuatehttps://valuate.getrefm.com/Multi-family core and value-add underwriting model from the rent roll through unit renovations, refi and sale.

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.