Our ultimate goal is to build our bank account and supplement our retirement income by acquiring 3-5 buy / hold within 5-7 years.

Not raising your rent annually means that you are supplementing your tenants rent.

I work on a freelance basis in the film industry and am looking to use long term buy and hold investing as a way to supplement my main work income so that I can spend more time with my family and less time worrying about finding the next gig.

If it's cash flow to supplement your current income, then go from there.

Less than 15% of participants rebalanced in any way back in 2015.Do I think 401(k) plans should be used to help supplement retirement?

We continue to work full time in our chosen career fields (higher education) and plan to slowly grow our supplemental income through rental properties.  

We are still focusing on rental portfolios for our funds and clients and supplementing flips in there to keep a nice balance.

Let's set the tone straight; most people don't get into the rental business because they like to manage problematic tenants, deal with leaky toilets or attend eviction hearings.Most people follow traditional investment strategies, that are taught to be passive, but that in reality are far from passive for the great majority of investors.At the very core, most people begin in therental business because they believe in the fundamentals of investing and desire to create some level of freedom and passive income to supplement their current income, and at the same time would like to have some sort of control over their investment.There is nothing wrong with this, and i certainly wouldn’t want to discourage anyone from buying rental houses, if that’s what you really want to do.

I do want to retire early enough to enjoy myself more, I have an okay work/life balance now but in say 5 years or so ideally I would like to quit my day job and have a few different sources of semi-passive income streams to enable me to spend more time doing what I like to do most (travel, spend more time with my wife and kids etc.).So in developing a plan, I was thinking today about my current goal of buying several SF and/or MF properties with reasonable CF over then next 5+ years to supplement my "early" retirement.  

Why aren't they renting the other space so that they can supplement their income?