The National Park Service may build an upscale hotel in a structure that once housed prison guards – on Alcatraz Island.

The park service runs the prison, which is San Francisco's second most-popular tourist attraction after the cable cars, Reuters reports.

The hotel is one of several proposals made to develop and renovate the area during the next 20 years.

The park service is taking comments on the proposals and will use public remarks to create a new draft of the general plan next year, a spokesperson told Reuters.