I keep my house and office at 69. 

You might find this 20 minute read and breakdown of supply, demand, interest rates, and relative regional pressures on multifamily https://www.biggerpockets.com/blog/multifamily-crash-to-cont...

There are many conventional products for 2-4 units whether as a house-hack or an investment.

We have marketed the property through 2 local brokers and in house.

I know I'm one of them, but that was how I was mentored to be 20 years ago.As for finding good deals, yes, you can find "pocket listings" and deals that stay somewhat in house, but that has more to do with the brokerage you're working with.

I own multiple LLCs and partnerships, and I’ll be moving between different houses over the next year.

I am a rookie investor working on building my portfolio and a structural engineer offering consulting on any structural concerns you have for houses you may buy, or if you want to know out a wall to open up some rooms in your next flip. 

Now for me and I did this back in the Carter years when rates where 18 to 20% and we had to do all sorts of financing magic..

I bought a 7 house portfolio from a private seller.

It’s a market rate 2 bedroom 2.5 bath townhome in a community that’s a mix of market rate and work force homes.