maybe you can do this for your house oaf? built-in storage in a loft space. I especially like the idea of shelves and drawers, but would need space to hang clothes too.maybe a custom/built-in wardrobe on the open end of the loft?
close up play room closet behind, utility room. open it like this to make laundry closet at the back door. Enclose the water heater. use space where w/d are now at right of door as a little built in seat for bags & coat hooks over it.