POWDR, a group that ran Park City Mountain Resort, the number three family ski resort in the country, got absorbed by Vail, its competition, and removed from ownership of its resort.
Because after twenty years of having the greatest lease in history (about 150,000 a year for a resort that grosses millions and millions) the end of the lease time rolled around... and they forgot to renew it. Literally, that's it. Someone didn't take down a note, and they turned their paperwork in three days late, got sued, and lost everything.
Do your paperwork.