Partially funding a 4-plex in Oakland using SDIRA

Hello,

I am considering buying a fourplex in the Oakland area. I have little over 100k in an IRA from previous employer. Let's say I buy a 4-plex worth 1 million with 20% down payment, I will have to shell 200k out of pocket, would it be possible and is it even a sane idea to use up the entire IRA for the down payment and fund the remainder of down payment from out of pocket? I also intend to owner occupy

I was thinking if there is a small studio or even a garage within the four plex ,that should cover the IRA part and the rent from that studio/garage can be accounted and deposited directly into the IRA account

please advise

thanks