The loan will be used to acquire new property and for rehabs.

Congrats on what you have already acquired. 

The repayment terms for a 401k participant loan are equal monthly/quarterly payments of principal and interest (typically prime plus 1%) over a 5 year term (longer if used to acquire your principal residence).Please note that if you take a full $50,000 and then pay back the loan, you can't take another $50,000 until 12 months after the first loan was fully paid back.Per the loan offset rules that went into effect with the 2018 Tax and Job Act: if you leave your job and the loan is current at the time you leave your job but then the loan goes into default because you left your job, you will have until your tax return deadline (including any timely filed extension) to make the loan current by depositing the outstanding balance into an IRA (and thereby avoid the taxes and penalties that would otherwise apply).Please keep in mind the multiple loan rules:Under those rules, the sum of the balances of a participant's outstanding 401k loans under a single 401k plan (using the highest outstanding balance of each loan over the last 12 months) can't exceed 50% or $50,000 whichever is less.

Or bought properties that the previous owners didn’t acquire permits.

---We came back to the table with a quick closing, minimized burden on the seller, and aggressive negotiating tactics which not only won us the deal but also allowed us to acquire this property FAR below market value!

I have 2 single family homes and am looking to get a third or possibly a duplex, but am having trouble finding financing. I have a 750+ credit score and have never missed a payment on either mortgage, but my income is...

Last year I acquired a six-plex and four-plex that I bought, remodeled and put on Airbnb. 

Purchase price: $27,000 Acquired this property from Tax Deed Auction Sale for $27,000 and it is being sold on a Lease Option for $62,500 and currently cash flowing $250/mo after expenses.Tenant/Buyer is responsible for all maintenance, utilities and closing costs.

Worth considering if you continue to acquire properties.

My plan is to treat these properties as I acquire them as a flip exit strategy but if the lease to own business model yields a decent buyer with a decent option fee, that may maximize profit for these smaller priced properties.