Right now treating it as interest but would like to make it active income to do a solo 401k .

This one will be interesting, in mountain view and it is very active. https://www.meetup.com/San-Jose-Real-Estate-Networking-Club/...

Leverage Tech: What apps, tools, or platforms would you use to streamline your daily activities?

I am actively working on a buyer and a personal money lender list. 

Uses the syndication depreciation losses to help offset active incomeI did read your post mentioned above @Michael Plaks which is very informative.

Problem is only "RE pros" get to do it.There are 3 income classifications in the US - Active, Portfolio, and PassiveActive income is income derived from your job, or normal trade or business.Portfolio income is derived from bank instruments - stocks, bonds, etc.Passive income is income earned from investments.Active losses can wipe out both passive and portfolio income, but it doesn't work the other way around.Portfolio (capital) losses are limited to $3,000 annually.Passive losses can only be offset by passive gains.Real estate rental income by its nature is deemed passive per IRC Sec 469One way to get around it is to become a pro - spend more than 750 hours or 1/2 your time in real estate.But most folks aren't real estate pros.

Currently flippers are much more active locally than buy and hold

When the syndication is sold in future years, are the gains, depreciation recapture, and distributions also taxed as active income?

We have worked with Investors and they are never really married to their Realtors unless you happen to connect with somebody looking to do a long-term hold and actively trying to find a good realistic deal. 

However, several random websites still have my original listing with the $30,000 price as an active listing and my phone number.