Or any other type of special financing that I have not heard of.

I use partnerships to help me fund my projects when it is hard to get financing.

I'm in the process of vetting some seller financed deals for my solo401k portfolio.

Quote from @Caleb Christopher: I use OnePoint Lending as the servicer for our seller finance and wraparound deals (www.onepointlending.com).

If I were to approach a seller of a $200k home, and they had a remaining mortgage of $100k, could I get a new bank financed loan for that $100k, and have the seller finance the remaining $100k of equity to me?   

I calculated her monthly payment is 1300.Since it is a vacant investment property where she will be taking a loss at sale and has been on market for 60 days, I am thinking seller financing may be mutually beneficial.I am planning to make 2 offers:300k with conventional mortgage.

I have a private investor who will lend his own capital for ADU financing.

Just keep in mind that using that emergency fund to buy your next property and having tapped a HELOC already may leave you in a bad spot if you run into a similar problem again.Also, I’m not 100% sure, but I have heard that personal loans don’t your credit more so than other types of debt so be sure you look into that if you go the personal loans route and then planned to finance your next purchase soon after.

@Dallas Morioka why use your own money when you can do seller financing. 

The park will be a lot more tricky to finance