Will Miss #103 - neighborhood mystery house

Within a 1 minute walk of my apartment, there is a huge house with a large accompanying garden which is surrounded by 5-foot walls topped with barbed wire and masked by trees. The entryways are boarded over or gated and you can see lots of mirrors, floodlights, and even security cameras behind the trees. I never see anyone coming or going (though I don't really keep tabs on it), but I know