The only way I would consider what you are proposing is if the equity from your coop is enough to place enough of  downpayment (think 50% of purchase price) on a small multifamily (think 3-4 family) so that the income from the new property is enough to cover all expenses of the new property as well as the loan (or a significant percentage thereof) on your personal residence.It's a gamble that can break you or be the beginnings of your real estate portfolio.

Then see what you are most thrilled about, take that cash and invest it while saving some as an emergency fund/retained earnings for those rainy days. 

It resulted in additional value of about $3.5 million so the investors were thrilled with the end result.Were all investors thrilled in the beginning with zero cash flow for a couple of quarters...no.The best sponsors in my opinion are those that are in regular communication with their investors to keep them updated.

Ours were plausible triplexes BUT there was a bit of a gamble involved.

Very few have been operated as a business...most are, at best, a hobby, where the Owner enjoys doing handyman work (often of dubious quality), at worst, an absolute "investment" Gamble, with no regard for tenants, laws, or much of anything but spending the absolute minimum while collecting the most money possible until their "cash cow" implodes.

Well if I was a long term tenant upstairs, and knew going in to it that the downstairs unit had a long term tenant, and that was going to change to different people coming in and out every week, I would not be thrilled if I was the LTR tenant upstairs.  

It also seems like a huge gamble to operate if I don't know quite for sure the variables involved to make a place have 33% occupancy rate on the year vs 75% occupancy rate on the year.

Stocks is gambling. 

If you wing it you will fail.According to (my) data with my selected assumptions, up to $5K spend on mailers is a gamble.

Most investors buy to make money, it seems you want to buy for the sake of doing a deal.perhaps you just want the appreciation and you'll pay the bills with your career income, just know that's gambling and we are in an appreciation slump for potentially a few years.