Step 1: Buy cool old building.
Step 2: Break up into tiny rooms. Decorate with rugged wooden desks and comfy chairs. Excellent lighting a must. Install pencil sharpener.
Step 3: Rent out space to writers! Apparently writers are so desperate to have a quiet space to work that they actually rent space. As far as I know this service is not being offered in Denver yet. I wonder if our basement would work?