Let's take a look at whether this underground bicycle garage is a private space or a public space. If it is public (estimated to be public), its ownership belongs to all owners. Without the permission of all owners, the property has no right to rent, and even if it is rented, the rental fee is owned by all owners. You can find the owners' Committee to coordinate. If there is no owners' committee, you can complain to the Housing Authority (the competent department of the property right unit) according to the Property Law and let the Housing Authority handle it. Call the mayor's hotline if you have any difficulties, and the Housing Authority will contact you actively.