What UNESCO site features the Americas’ oldest gubernatorial mansion?

Here is the question :

WHAT UNESCO SITE FEATURES THE AMERICAS’ OLDEST GUBERNATORIAL MANSION?

Here is the option for the question :

California
Puerto Rico
Maryland
Pennsylvania

The Answer:

And, the answer for the the question is :

Puerto Rico

Explanation:

[STC009476]. San Juan, Puerto Rico, was founded in 1521, making it the second-oldest capital city in the Western Hemisphere. As such, it is not surprise that the city contains a large number of historical buildings. One of these is the La Fortaleza Governor’s residence, which holds the record for being the oldest governor’s residence that has always been occupied. It was constructed in 1540, and since then, it has served as the official residence for more than 170 governors of Puerto Rico. It was designated a UNESCO World Heritage Site in 1983 along with the nearby La Fortaleza and San Juan National Historic Site.