The 'shovel-ready' value add will be a compelling feature but could cost a lot.

For illustration purposes a quad consisting of all one bed one bath units will cost a lot less to build than a quad consisting of all 3 bed 3 bath units.....

Others differences that jump out: loan parameters are stiffer (usually 20 terms on a mortgage instead of 30 year), commercial insurance will be more expensive, appraisals will cost a good bit more.

The pickleball court if done well doesn't need to cost a fortune and can be multipurpose and serve as basketball or other types of courts.

"organizing" 15 LLC's would cost a minimum of $500 per year per unit here in North Carolina plus the headache of book keeping. 

A single LLC and a single revocable trust won't cost much.  100 LLCs and 10 trusts will cost a lot.A simple revocable trust in many states won't cost you anything after it is set up. 

Sometimes, hard money for rehabs/flips may cost a little more buy may be less risky overall.

In some cases it may cost a vendor half as much to work with Roofstock as opposed to other promotional companies.

When you buy a property, the only cost a REI pays is the cash out of pocket.  

This will cost a bit, but you will be provided with a written report of the things they find wrong.