I got like a 800 bill one month for an apartment not much larger than you describe. Then close to that the next. Turned out they had routed the hot water from

I got like a 800 bill one month for an apartment not much larger than you describe. Then close to that the next. Turned out they had routed the hot water from the heater under the foundation to the taps and there was a leak. They came and jackhammered up a section of floor and fixed it and apartment complex wound up crediting me for rent.