(For background--I'm both an investor and own a restoration company) The short answer is no--you don't return the difference back, but it's a bit more complicated than that.

This claim only complicated the matter more.

Over thinking complicates the body and the mind (TOOL).

For the next step, I need to get the answer for the switch to the FHA mortgage to commercial loan/Owner occupied for one apt. and it looks complicated for my Broker. 

For the next step, I need to get the answer for the switch to the FHA mortgage to commercial loan/Owner occupied for one apt. and it looks complicated for my Broker.

Now the project faces another, potentially even greater, complication.

It's not too complicated.

It can't really be that complicated.

If by commercial you mean retail/office type property then one of the large differences that makes it slightly more complicated is setting a rent that you will be happy receiving into the future as typically you would want to lock in longer term leases.

In addition, some waterfall structures are complicated enough that the LPs can't easily track what they should be receiving which can cause some mistrust between GP and LP.I prefer a much simpler structure where the  GP takes a flat percentage of profits.