So if you purchased one 4-plex each year, after 10 years you would have about $12K per month in cash flow.

I would like to put the money into purchasing another investment property.

When I am looking for a new investment property and am strapped for cash, I typically look off-market and try and find something that can a seller is looking to sell that needs minimal repairs to be rent ready and the purchase price is 80% of the ARV this way I can use private money to buy in cash, do the repairs needed then refinance on a DSCR loan and pay off the private money loan. 

Quote from @Scott Vaeth: I purchased a house in South Carolina this past year with the goal of BRRRRing it.

You can potentially purchase multiple properties, which is a huge plus for spreading out risk.

However, achieving success in this space requires more than purchasing property—it takes strategy.

Make sure your real estate agent isn't just about closing that one deal but understands the benefit of protecting you on each purchase to ensure that you keep buying because you are enjoying success.  2.

I have a proven track record of being able to identify a property, make the appropriate repairs, and have an ARV that exceeds the cost of purchase and repair.

I would make sure a bundle of rights for ownership are available individually, per unit of course, then worry about warranty and purchase options.

I've personally found the bulk of my Chicago purchases off the MLS.