http://www.noticiasteocraticas.org/cuba-un-milagro-llamado-betel/
This link will take you to more pictures of the Cuban Bethel and its operation, most of the information is in Spanish but the photos speak by themselves.
Across the street from that building there is park called the "Japanese Park"; as a norm two undercover agents from the government were posted in that park watching Betel activities. Like I said before when things started to get ugly the Branch kept their normal operations, this made easy for the security forces to raid the Branch and in one scoop get all the relevant targets.
After that things changed, an elderly brother named Callendar was assigned as the Branch Representative and he and a few sister were the only ones left taking care of the building.
Bethel became a roving office, moving from location to location on a regular basis; my understanding is that was kept until 1994 when restrictions were relaxed.