"Casa Blanca" (White House) Residence of Juan Ponce de Leon, First Governor of Puerto Rico

"This splendid building was the residence of the Ponce de Leon family,. The structure was originally built in 1523 and used as a fortress and arsenal until 1531, when it was first occupied as a residence. Juan Ponce de Leon was the first Governor of Puerto Rico."

Photo from a Souvenir book of Puerto Rico, published in the  1940's by Matias Photo Shop, San Juan, P.R.