We gutted the interior down to the cinder blocks, re-designed the unit layout to fit a more modern lifestyle.

Do you have a plan in place for the re-lease?

The click on / locking type seems like what most investors use, but repairs seem difficult without having to re-do a large area. 

It's a great starter book for the financial foundations of real estate investing: https://store.biggerpockets.com/products/set-for-life-revise...I would also recommend Small and Mighty by Chad Carson: https://store.biggerpockets.com/products/small-and-mighty-re...Real Estate Rookie: https://store.biggerpockets.com/products/real-estate-rookieHouse Hacking: https://store.biggerpockets.com/products/the-house-hacking-s...

Basically at 20 years, investors would have 16 properties in RE portfolio, with approximately $14 - $24 Million in the account. 

You will likely have cracked drywall and porches will have to be re-installed.

A good agent, who understands RE investing (and actually owns their own) is a great place to start

Do I need to RE- invest $750k in worth of real estate) or just the $400k of proceeds in real estate?  

There is never an agenda, just a bunch of RE junkies drinking coffee and chatting about the market, local news/regulations, and helping each other find their way in the vast world of Real Estate! 

My point is: the question is about open vs concealed vs no carry for a RE business.