Thought its history, McConnell Valdés has had an active role in in the creation and development some of Puerto Rico's most important projects:
- Centro de Bellas Artes Luis A. Ferré
- Centro de Convenciones
- Centro Europa (first step in the urban renewal process of the Santurce neighborhood of San Juan)
- Coliseo de PR
- Condado Plaza Hotel’s expansion into the Laguna Wing (with the first-ever connecting bridge over a public avenue)
- Condado Vanderbilt Hotel renovation
- Distrito T-Mobile
- Dorado Beach Resort.
- El Conquistador Resort
- Fairmont El San Juan Hotel
- Grand Reserve Resort (formerly Coco Beach Resort)
- Highway 22/5 Concession (PPP)
- Hotel El Convento, Puerto Rico’s first historic hotel
- Hyatt House Convention Center
- Hyatt Place (Bayamón, Manatí and San Juan)
- La Concha Hotel renovation
- Mall of San Juan
- McConnell Valdés building (270 Muñoz Rivera)
- Palmas del Mar
- Ponce Hilton
- Punta Lima Wind Farm
- Ritz Carlton Isla Verde
- Ritz Carlton Reserve Dorado Beach
- Royal Sonesta Isla Verde
- Royal Sonesta San Juan (formerly the Intercontinental Hotel)
- Santa Isabel Wind Farm
- Teodoro Moscoso Bridge
- Toroverde Adventure Park
- W Vieques
- Wyndham Rio Mar Resort
