Meek Mill -- It's Just a Little Crack ... I Didn't Trash Glass House

Meek Mill's Grammy party guests didn't trash Justin Bieber's famous glass palace -- they merely left a few cracks, according to Mill's attorney ... but there's still a war brewing over his $10K deposit.

Mill's attorney, Richard Joseph, denies leaving the mansion -- formerly rented by Bieber -- in shambles following the epic bash on Sunday night. He says there was a minor window crack, and a few scuffs on the walls ... but nothing that would qualify as "trashing."

Sources with direct knowledge of the lease for the house tell a much different story. TMZ obtained photos that appear to back up claims the place looked like a war zone, with damage including:

- a kicked in door with shattered windows

- dead landscaping

- broken glass in the pool

- destroyed furniture and cigarette smoke damage

Joseph claims those damages were never mentioned to him, and no one raised the possibility of holding his deposit. He also points out ... his name is on the lease, NOT Meek's.