An engineer's mind may need higher control over investment :)))
let's check on the scenario of independent investing: with 40K down and conventional mortgage you could get a decent quality old duplex in the good location of Midwest. Let's say in Blue Springs, Lees Summit, Belton, Grandview, MO you could buy a duplex for 150K, monthly cash flow 1,400. Minus mortgage (30 years fix around 5%), taxes, insurance, property management company, maintenance, and repairs, you will end up with a few hundred dollars positive cash flow while building an equity. Let's be optimistic and say you will end up with 4K positive cash flow for a year, which is 10% cash on cash return. Any major problem (roof, basement, conditioner, driveway, tenant turnover, etc) may cost 5K. So potentially you may be spending more money on deferral maintenance before you will see positive cash flow. After you will be done with deferral maintenance in a few years you may be able to increase the rent and see a better cash flow. After you spent more money on repairs and improvements your cash on cash return may still be below 10%.
Now compare this number with the opportunity of passive investing with a pool of other investors into the apartment building or commercial real estate.
One more opportunity is to keep the cash and wait for the market downturn, which may be due in a few years.