@Caleb Heimsoth
I appreciate your response... even though it is somewhat arrogant. Curious about your response, so I went and read your profile...now I understand!
Your thought process is way too minimal and inhibits your ability to greatness...with all that 'educational knowledge' you achieved, why are you holding your future abilities back by expecting only 20 unit's from 2020-2030?! For one, and this is just my personal opinion based upon all my DD...I'd get into markets where the job growth is substantial as is the migration, purchase 'B' class properties so your ability to raise the rent at a minimum 3.5% national average is achieved annually and many other factors I'd suggest as well, but the biggest would be to look elsewhere other than Memphis, etc.
As for getting to 1,000 units within 20 year's it's very possible! Every 3-5 years I'll move up in unit's...ie. 8-12 to 32 to 80 to 150 to 400 to 1,000...
Good luck and much success to you!