This is building is rumoured to be the Guard Room and cells (on Masirah? there is nowhere to go) Not a lot is left of what was the old RAF Sea Plane base on Masirah. This building use to have a board that said RAF 1936 above the door until the 1970's, from other pictures on the net it appears that erosion of the foundations caused the walls to collapse. I have no idea what its present condition is.

I have since read that this was a secure fuel store for visiting sea planes, hence the bars on the windows. Each sea plane had a key to the door. which would make more sense.