High-Security Buildings

Thinking maybe it's a programming thing- the store is the newest building, maybe it wasn't planned to be part of the event just as the liquor store wasn't part of the Easter event. The houseboat, due to being in the water as opposed to on the tiles, maybe causing conflict with the event programming thus easier to exclude it from being spied on rather than try to include it...

Vulgari is probably too new, same thing happened with fudge factory and easter eggs. As for the houseboat, wasn't it disabled later, together with krustyland entrance? I may be wrong, but there's a precise reason if they disabled those buildings, or maybe it was something else.