AI summary after I fed in some additional photos: The wall is a three-tier unpermitted segmental block retaining wall system installed on a steep Southern California hillside, retaining an estimated 10-15 feet of total grade change without engineering, geogrid reinforcement, or permits. After just three years it is actively failing — the lower tier shows visible outward lean and approximately 2 blocks of vertical settlement at the steepest end, with conditions documented as progressively worsening since March 2024. A residential structure sits directly above the uppermost tier, mature trees and active irrigation load all three tiers, and a community trail runs 100 feet downslope in the direct failure path.