I currently work at a company called Catalyst Design Group where we do mostly large scale work on apartments, townhomes and more.

The 4th bullet is a weirdly coherent merger of 2 other bullets from the original 12 (not that you'd need to use an attorney and accountant to set up your cozy.co account), just that the sentence totally makes sense otherwise. 

The downfalls to SFH are that it is harder to scale your business as you grow, there is more work in property management, which increases your costs, and the loans get harder to get as you grow. 

So I fall on the low risk side of the REI investing scale.

I'm looking for a system that can scale my wholesale business.

Mom and pops many tend to deal with the owners directly and can make a decision quicker with putting in an LOI and executing the lease phase.Regional to national tenants that are scaling tend to have SELECT TENANT brokers they work through.

As @Tyler Kastelberg mentioned, you're much better of with MFH in terms of scaling and reducing your risk.

We have worked previously with Chris Brown of Edmund & Wheeler, Inc who specialize in larger scale 1031 requests (his site can be found via Google). 

I would like to scale up and to bet on apriciation might not help me much in doing that.

ORThe investor may have enough to buy ONE property with their own cash, but that will tie up all of their funds, and they cannot scale / thus make more money.