Trump agreed to turn over the land for both the park and the highway relocation. He also agreed to create a public park with private funds. But opponents maintained that any complementary public funding to bury the road would benefit only the developer. And the new mayor and governor declined to immediately relocate the highway because, they argued, relocation would effectively waste the public funds used for the viaduct renovation, which had already begun. Other opponents were upset by the decision to close the West Side Highway northbound entrance and exit ramps at 72nd Street and fought to deny the highway project any funding, thinking that they could thereby scuttle the entire development. Nevertheless, planning proceeded, albeit in fits and starts. Approved by the Federal Highway Administration in 2001, the highway plan called for relocating the elevated highway to the grade of the rail yard east of the present alignment, constructing supports for Riverside Boulevard in the form of a tunnel that would enclose the highway's northbound lanes, with the future park beginning above an adjacent tunnel enclosing the southbound lanes and continuing on a slope down to the waterfront. The exit ramp was subsequently closed and, in June 2006, the developer began construction of the northbound tunnel between 61st and 65th Streets. However, the rest of the tunnel remains unfinished. Opening and new developers The project was jointly developed by the Trump Organization and Hudson Waterfront Associates, representing the Hong Kong investors. In 2005, the Chinese investors sold the project, excluding the finished condominiums, to the Carlyle Group and the Extell Development Company. Contending that the sale for $1.76 billion was little more than half what the property was worth, Trump sued his partners, but lost. Carlyle and Extell then sold the three apartment buildings with rental units to Equity Residential. In late 2008, Extell proposed a , largely residential project on the southern two blocks (59th to 61st Streets) to complete the development (up from – the of studio space plus of residential space already approved). The Extell project, known as Riverside Center, was approved by the City Council in 2010. Components Buildings The second phase of Riverside South was completed when the housing market improved. Extell completed three buildings: The Avery (100 Riverside Boulevard), a 32-floor, 274-unit tower; The Rushmore (80 Riverside Boulevard), a group of 43-story towers that share sixteen lower floors and contain a combined