The owner of the directory can write it.
A member of the directory's group other than its owner cannot access it at all.
Additionally the SGID bit is set, which means new files and subdirectories created in this directory will inherit its user ID. The SGID bit is inherited on new subdirectories. (Existing resources, including any that are moved into this directory, are not affected.)
Any other user on the system can write and list/navigate into it.