It includes five contributing buildings: the Calvo-Torres, Rosario, Martinez-Notley, Lujan and Leon Guerrero houses.

While a few scattered other individual structures survive, all else has been destroyed by World War II, termites, typhoons Karen of 1962 and Pamela of 1976, and other causes.

They are also significant for tie to the Spanish colonial era and the use of ifil wood prior to Guam's deforestation.

The oldest part, built of manposteria (coral mixed with lime mortar), once hosted a silversmith.

It is described as having massing and overall character with "strong Spanish overtones"; it is largely surrounded by manposteria walls.