Plenty of space.
I'd want to have my HQ out to its full length.
Room for a big permanent design wall.
Boocases and the Antonius systems from IKEA.
Room for a quilting buddy or 2 to come over for sew-ins.
An adjacent bathroom
Great lighting, maybe even a solar tube or two. Down here they are much cooler to use and they are less expensive too.
Lots of electrical outlets. So I can rearrange as I want.
A nook for reading and drinking my tea and chats with a friend or 2.
And, best of all: a big budget!
ali