It's not usually done unless it's a kludge to try to hide a mistake.

You wall cabinets need to be hung with their bottom at 54" above the floor, or else they will not align with the tall cabinets like a fridge cabinet or pantry, or wall oven cabinet. If you are doing staggered height cabinets, you also need to do staggered depth cabinets or else the crown molding doesn't have any place to die into. In other words, your OTR MW cabinet needs to be 15" deep if it's going to be taller than the surrounding cabinets. Also, if you're doing the taller corner cabinets as well, they should be the 27" deep ones as well as being taller.

What height "regular" wall cabinets are you using?Do you have an elevation of the design that you can post?

"It's not usually done unless it's a kludge to try to hide a mistake."
Then I won't do it....Will call on Tuesday and have the 24" changed to a 18" so Crown will all be same size.
But won't that still make the height of the cabinets different from the others?

Surrounding cabinet on either side is 30" then there is a 36" corner cabinet next to that.
These were not Custom made and they only come in standard depth.
Here is a picture of the same cabinets (different color) I will be getting but will be using different molding.

These were done by someone at the cabinet place where I'm getting mine from. He sent me this picture and said he does the crown molding on these cabinets all the time.
I am hoping this will all work out for the best....right now I am worried!

If you're only using 30" tall cabinets, then your OTR cabinet should only be 12" tall. OTR's are 16"+ and will hang down WAY too low with an 18". You wouldn't be able to get a pot on the stove!

Guess I am not understanding...??
The 30" is the lower staggered cabinet...the higher cabinet is the 36" and the way the plan shows is the 36" and the over OTR Cabinet is the same height...not the 30" cabinet..