To give you my $.02 worth. The 1st thing I seen is, I would for a door from my office to the conference room or is that a breakroom? The 2nd thing I see is the pickup comes in to the big door and in my opinion that would lose a more heat in the winter so for that reason I would add a smaller overhead door on the east. I would also consider taking the offices breakroom/conference room, bathroom and laundry room and make it a lean to to the north.

You are right on the cost.  I added a 12x20 lean onto my 66x90 shop when I built it, the builder told me not to because of expense, but I did it anyway, big mistake I could have added 20+ feet onto the back of the 66 foot wide shop for the same money, I'm an idiot!  The building could have been 66x110, oh well.

That would build a 1000 square foot house. Pretty spiffy office. I built a 24x18 bumped out of my shop. Spent too much but nowhere near $120 a square foot.

This is a nice layout.

Yup . ..  . sq footage wise, lean too's are the most expensive structures . . . .Two outside walls/roofs are more expensive then one outside wall/roof ~