<P> The Executive Residence is the central building of the White House complex located between the East Wing and West Wing . It is the most recognizable part of the complex, being the actual "house" part of the White House . This central building, first constructed from 1792 to 1800, is home to the President of the United States and the First Family . The Executive Residence primarily occupies four floors: the Ground Floor, the State Floor, the Second Floor, and the Third Floor . A two - story sub-basement with mezzanine, created during the 1948--to - 1952 Truman reconstruction, is used for HVAC and mechanical systems, storage, and service areas . </P> <P> This level was added during the 1948 - to - 1952 renovation, and contains the air conditioning and water softening equipment . The sub-basement and mezzanine also contain storage areas, the heating system, elevator machinery rooms, an incinerator, a medical clinic, a dentist's office, the electrical control system, a laundry room, and flatware and dishware storage . </P>

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