access way 26 once the access way 26 is open a mating structure 18 such as the stairs which are illustrated for example can pass therethrough one skilled in the art will realize that any structure that provides vertical access can serve as the mating structure 18 other examples are telescoping ladders and elevators the mating structure 18 is retractable into the housing 12 and is lockable in that position to insure security to the housing 12 the method of retraction is again design specific and ranges from a manual spring biased structure to a structure having electric motors to cause retraction and engagement for example in the preferred embodiment each such mating structure 18 can be locked and in one embodiment engaged using a key at ground level for homes that are known to be unoccupied for long periods of time an elevated and lockable mating structure 18 is a desirable element of security if the mating structure 18 is the primary means of ingress an intruder would need a ladder to enter the housing 12 thus becoming highly visible thereby discouraging such actions when the mating structure 18 is unlocked a force moves the mating structure 18 into an engaged position in the illustrated embodiment the mating structure 18 is a flight of stairs which is rotatably connected at one end to the housing 12 the force is manual and is actuated by pulling a rope from below or pushing down from above though electric motors can be substituted without detriment to the invention actuation as described causes the mating structure 18.