Company parking lots are part of the employer's premises and therefore part of the establishment, if these areas are under the control of the employer.  However, a parking area where the employer does not have control (such as a parking lot outside of a building shared by different employers, or a public parking area like those found at a mall or beneath a multi-employer office building) would not be considered part of the employers establishment (except for the owner of the building or mall), and therefore not a company parking lot for purposes of OSHA recordkeeping.