Unfortunately, you cannot rename a space at this time. Instead, you'll need to do one of two things: 

1. Create a brand new space from scratch with the correct name. This is best if you're also interested in a new office design at this time, such as choosing a different template size or style.
2. Copy an existing space and give it the new name that you prefer. This is best if you want to keep your current office design in terms of the map and objects. 

When you copy an existing space, only the map and objects will be copied over. You'll need to redo your space settings, invite people into the new space and re-assign desks, and set up a new subscription. Don't forget to cancel the subscription in your old space if necessary.