Puerto Rico last week released a request for proposals that will begin the bidding by four short-listed contenders to run and maintain its busiest toll road.

The four consortium have until March 7 to file their submissions, with best and final offers, if necessary, set for the week of March 21. The four firms are: Abertis Infraestructuras of Spain and ­Goldman Sachs Infrastructure Partners II LP; CCR (Companhia de Concessôes Rodoviárias), based in Brazil; ­Itínere Infraestructuras SA of Spain and Citi Infrastructure Investors; and OHL Concesiones of Spain and Morgan Stanley Infrastructure Inc.

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