Many people probably pass data centers every day without realizing it. Some might occupy a small building in a neighborhood. Another might occupy several floors in a downtown office tower. Banks, streaming companies, and other businesses rent space in them to store and process data.

You can see one from Seattle’s Monorail, one door south of Palace Kitchen (or a block south of Top Pot Donuts, if you prefer). Look for several stories with no windows on top of a ground-floor parking garage. In total, Seattle has roughly 30 data centers operating within city limits.

The kind of data centers targeted by the new moratorium are medium-sized — bigger than the server room you’d find in many businesses in Seattle. But much smaller than the giant campuses found in places like Quincy, Washington (those would be illegal, too, but no one’s proposed anything that large in Seattle yet).