Hey @MChat; thanks for joining our Community!
If you're no longer connected to that account, those files are only local copies of the files you had been sharing so you should be safe to delete them from your computer without affecting your office's files at all.
If you have the desktop app installed on your computer and it's still connected to that account somehow, you'll need to unlink the account through the app's preferences before you delete the content of your Dropbox folder.
Let me know if this makes sense!