Recently, I met an apartment investor who uses private investors for his purchases. 

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Hello and welcome,Best move I made was taking some time to put a plan on paper, talking with some investors, and a bunch of reading before jumping in.

You could start your search by reaching out to lenders, brokers or other investors you meet at REI meetups.

Yasmin, I cannot speak on Hagerstown, but with REI in Pittsburgh, there's investors flocking to the area to get in on this market.

I'm lucky enough to have a seasoned investor on my team of 30+ years in my father-in-law.

That's a great deal in this market and 5 other investor would be making offers.

You should look into DSCR Loans - many investors like yourself typically move to this loan product once they max out with DTI/qualifying conventionally - a bit higher in rate than conventional mortgages - but no DTI ratio or tax returns/income verification makes a much easier qualification process and LLCs are 100% ok (even as sole owner) and actually often preferred.PS - published a 10-part article series here on BP last year on everything you'd want to know on these loan types - sharing links below, hope it can help!

I've been a passive investor but venturing into BRRRR zone.

I am both an investor and realtor....