This was how I did it until I retired. 

Here is a list of lenders who specialize in this:https://www.biggerpockets.com/member-blogs/2810/50272-list-o...Doing private lending from 401k is arguably the best way to invest your retirement funds.

I was successful and able to retire early from my career. 

I was medically retired last year in September and moved here for my job in the post office.

My goal right now is to retire my fiance and try to be more in control of what we do in our lives when it comes to making money.

I'm wanting to start to develop my rental portfolio for long term goals and retirement!

We found some properties from retiring land developers who did not want to take the project 3-5 years longer.

I will use it to get another HELOC , pay it off in 5 yrs, then rinse repeat eventually part of funding my retirement income since i am 57 yrs old and had lost most financial security when my spouse divoced me.  

I'm not aware of any other real-estate related options, and outside of having a business of some sort to have write-offs, I only know of the traditional things like maxing out retirement contributions and such.  

I'm 20 years old and have about $105,000 outside of retirement that I'd love to do something with.