A comprehensive engineering investigation reveals the Rialto Apartments in Orlando have been sinking into underground voids for over a decade, displacing more than 350 residents who may never return to their homes as engineers struggle to find a solution for stabilizing the compromised property.
Decade-Long Ground Movement Detected
Simpson Gumpertz & Heger released a 140-page structural and geotechnical report commissioned by property owner Northland following the March evacuation of the Sand Lake Road complex. The investigation determined that portions of the building have dropped approximately two inches on average since 2016, with greater displacement near the most severely damaged apartment units. Satellite monitoring data confirms the downward movement continues today, affecting the entire building footprint rather than isolated sections.
Engineers traced the ongoing subsidence to soil infiltrating voids within the underlying limestone bedrock. This phenomenon represents classic karst terrain behavior common throughout central Florida, where acidic groundwater gradually dissolves limestone formations over time. The investigation definitively ruled out plumbing failures, drainage issues, or utility system leaks as contributing factors to the structural damage.
Extensive Damage Throughout Complex
Residents first reported alarming signs in March, including loud popping sounds, visible cracking throughout units, and doors that refused to open or close properly. Engineers discovered a 15-foot-wide, three-foot-deep void beneath two apartment stacks that caused the most severe structural compromise. However, investigators identified numerous smaller voids distributed throughout the property, creating widespread damage. Units 145 and 147 sustained the most extensive deterioration, prompting emergency stabilization work that proved insufficient to restore habitability.
The building currently satisfies two statutory criteria under Florida law defining structural damage involving excessive foundation and floor movement. Engineers completed temporary stabilization beneath the worst-affected units, but the property remains uninhabitable six months after evacuation. The financial toll on displaced tenants prompted the property owner to offer cash assistance and later proposed settlement agreements requiring residents to waive certain legal claims.
Uncertain Future for Residents
Engineers recommended filling all voids beneath the structure to restore support, but cautioned this alone cannot halt the broader subsidence pattern. Comprehensive stabilization requires either extensive grouting or deep foundation systems reaching stable bedrock more than 200 feet underground. The extreme depth presents significant technical and financial challenges. Engineers will next assess whether any long-term mitigation proves feasible. Options for heavily damaged sections include targeted repairs, structural lifting and releveling, or complete demolition and reconstruction. Orange County’s Division of Building Safety continues monitoring the vacant property while awaiting the owner’s decision on how to proceed with permit applications.
