If the foundation is good, the roof is good, the floors are good, the layout is good, you are probably saving at least $100k right there in labor/materials.The other thing that frequents adds a lot of cost is when the unknown occurs.  

They don't charge an arm and a leg, and my experience with them has been pretty great so far.

Charge market rate.

If so are they charging rent for those? 

They acknowledged that if the tenant wants it adjusted to exclude that area then we'll revise, but they want to charge for the entire space...to them it is an integral component to leasing the yard since the City mandates screening landscape.

Quote from @Lincoln Waite: I'm certain you are not charging enough for rent.

It may sound nice to pay a 5% management fee but the extra fees can add up to be more than the other company that charges 10% with no add-on fees.

They should also be able to get paid in certain scenarios other that selling and/or they can charge an up front retainer fee to charge you for the paperwork if that is all they do.

It doesn't book as frequently as the smaller house, but generates more income.

I frequently see where one party is awarded the property and debt and is mandated to sell or refinance it within a certain timeframe to have the other party removed from the note/mortgage.