Alphonso v. Comr., 136 T.C. 247 (2011)

(taxpayer suffered collapse of retaining wall at taxpayer's cooperative housing complex and claimed a casualty loss associated with the collapse of the wall that separated the housing complex from public roads; taxpayer, as shareholder, assessed portion of damage and claimed casualty loss; IRS denied deduction because collapse gradual in nature and did not result from event of sudden, unusual or unexpected nature, and because collapse was on property owned by the cooperative rather than the shareholder; taxpayer did not have sufficient property rights in common areas - no "equitable easement").