What my worker did is to nail down some finish nails, and it seems to be fine for now.

I think you hit the nail on the head a lack of respect, prudent judgment and just plain old greed influence those seeking funds.

It also saves space and labor (less joist pockets that have to be busted out of the brick, less joists to shim and level into joist pockets, less joists to glue and nail together, etc.).  

Basically, once you nail your first deal and gain all that equity, it's a matter of pulling cash out to buy into another project.

. - you pretty much nailed it there.

@Troy Zsofka and @Jay Hinrichs hit the nail on the head.

@Jay Hinrichs whose words on these BP forums I have to say are worth more than gold, really nails it that TK generally works if you know the people who will be taking care of your property very intimately, as well as if you scale your TK properties (i.e. you own 20-100+ properties rather than just 1 or 2).  

Again, congratulations on nailing this one down.  

Then we had to tie the trusses, blocking, and walls together with 1/2" sheathing and a lot of ring shanked nails. 

Before you proceed, be sure you've nailed down your intent and can express that succinctly in writing - - that will go a long way to impress the powers that be that you know what to do and how to get it done.