The Capitol is also commonly referred to as the Palace of Laws (Spanish: Palacio de las Leyes).
As you can see right behind the Capitol Building is the Port of San Juan.
The "Port of San Juan" is the general name used to call various passenger and cargo facilities located in lands around the San Juan Bay (Bahía de San Juan). The port is composed of a total of sixteen piers, of which eight are used for passenger ships and eight for cargo ships. The port's facilities, in addition to, Luis Muñoz Marín International Airport and the Cataño Ferry "Lancha de Cataño" services, are property of the Puerto Rico Ports Authority.
The bay and its docks are located along San Antonio Canal, a narrow navigable section of San Juan Bay lying south of Old San Juan and San Juan island, and north and west of the Puerto Rico Convention Center District and Isla Grande Airport. The municipalities of Cataño, Guaynabo and San Juan compose the south side of the bay and port.
For more information click here.
Source: wikipedia.com