For life threatening emergencies, dial 911. A building/unit emergency would include: broken pipes, leaks/water overflowing, a fire (after fire department has been notified), parking gate won't open. If there is a power outage, check the basics first - Did any of the switches get tripped in the breaker box? Is the power out in the building and/or area? If so call your utility provider for a status update. Also, if you smell Gas call the Gas Company immediately and they will send a field rep out immediately at no charge to you.