yes.
a storefront can be opened on the side of a stepped pedestrian street, but it must be owned by others, and it will not hinder others' travel. You can open a tea shop or snack bar under the stairs, you can go to the industry and commerce to apply for a business license, and the health department to apply for a health permit, as well as employees to apply for a health certificate.
121-square shops can do catering. If it's on the first floor, it's for entertainment and some tables. On the second floor, it can be mainly used as a dining area, and it can also hold a lot of tables, so that it can take many customers.