Ocean Tower

The Ocean Tower project was developed by Coastal Constructors Southwest Ventures, a subsidiary of Zachry Construction. It was designed as a 31-story luxury high-rise featuring 147 residences, a gym, swimming pools, spa, and a media room. The podium of the building was a large parking garage with the homes beginning at 55 feet (17 m) above sea level. The completed building would stand 445 feet (136 m) tall and be one of the tallest structures in the Rio Grande Valley.[3] The building was designed to withstand extreme winds with three massively reinforced core walls.[4] The location was to have allowed the residences to have views across the Gulf of Mexico and the Laguna Madre.[5] Units were to retail for $2 million.[6]

After a month of structural testing the construction of Ocean Tower began on April 5, 2006.[3] It continued for two years with much of the main structure completed until differential settlement saw parts of the building sink by over 14 inches (360 mm). Pier supports in the shifting clay more than 100 feet (30 m) underground began buckling, stressing beams and columns, causing cracking, spalling, and breaking, eventually causing the building to lean towards the northwest corner, cracking the wall of the adjacent garage, which abuts the tower.[6][7][8] The official explanation was that the parking garage and the tower were mistakenly built connected, forcing the weight down upon the garage instead of on the tower's core. The use of expandable clay, which compresses when weight is applied to it, compounded the issue and allowed the parking garage to remain relatively unsettled compared to the tower itself. Preliminary evaluation showed that the tower's core had sunk 14 to 16 inches (360 to 410 mm), while the attached parking lot had shifted less than half that distance.[2]

Construction was halted in the summer of 2008.[9] Soon after, the building became known as the "leaning tower of South Padre" and was viewed as a looming eyesore.[6][10]

In a letter dated July 2, 2008 the developers informed buyers about the problems that they had encountered. They reassured them "Your unit will be delivered, and the building will be stronger and safer than ever", stating that completion of the construction would be delayed by "6 to 9 months".[5][6] The proposed fixes would have the garage beams separated from the tower, and new columns to be placed under the beams. Once the columns had been fully braced, then garage beams would be cut away and the foundation would be repaired.[11][5] By this time more than 100 of the condominiums had been sold.

On November 4, 2008, after several engineering studies had discovered that the work needed to fix the building would prevent the project from becoming economically viable, the development was officially cancelled and purchasers were released from their unit purchase agreements.[12][13]

Any materials that could be recycled or resold, including fixtures and fittings, steel, flooring, and windows, were removed from the building before demolition. The nearby Texas Park Road 100 was closed on safety grounds just before the building was set to be razed.[10] At 9am on December 13, 2009, the building was imploded by Controlled Demolition, Inc. By the time it fell the building weighed 55,000 short tons (50,000 t) and is reported to be the tallest and largest reinforced concrete structure ever imploded.[6][9][14][1]

The implosion was watched by a large crowd, many of whom stayed in local hotels and visited restaurants in the area. Island spokesman Dan Quandt described the event as "a very good short-term economic boost for South Padre Island".[6]

The developers have filed a $125 million lawsuit against geotechnical engineering firm Raba-Kistner Engineering and Consulting of San Antonio and structural engineers Datum Engineers of Austin and Dallas.[2]

• List of tallest voluntarily demolished buildings