Abstract: This invention relates to a building having a central unit defined and enclosed by a peripheral main section therearound. The central unit has a transparent roof to permit the passage of solar energy therethrough to heat the air and other contents of a courtyard thereunder. The central unit also has a heat storage mass under the courtyard for storage and retrieval of energy during selected periods. The edges of the dome rest upon the walls of the main section defining the courtyard. Such walls rest upon the foundation walls defining the heat storage section containing the heat storage mass.