The structure is technically able to be moved by a simple disassembly process and the installation can be completed in as little as 4 days with the installation crew.Some of the key details are that our materials are sustainable, recyclable, healthy, use building science, and our exterior panels sequester carbon instead of producing it like traditional concrete.

What are key approaches I need to have when doing this? 

I had purchased a building in 2009 in the Old West End and I was standing outside when a man approached me saying he owned a 45 unit apartment building with a 30 car parking garage across the street that he wanted to sell to me.

If they had a verbal agreement with the last tenant,   and the last tenant gave notice or has officially abandoned per definition thereof  (you can look for things like them having cancelled their utility accounts, emptied unit of their belongings, etc)  then they can't prove anything and maybe you can use that approach.   

Or is there a healthy balance of 50/50?

I'm noob and just building my own goals so helpful to see other approaches.

Sounds like you are approaching "Hurt City".

I completely agree with the business hours approach to repairs.

If you do find something approaching the 1% rule, it very likely could be a D-class neighborhood.

However, these investors have experience and knowledge in their market and most importantly are NOT using the "no money" approach because they can't afford to put down  money for a traditional down payment.