There are two components of the term common area. If referred to with the Load Factor calculation, the common areas are those areas within a building that are available for common use by all tenants of groups of tenants and their invitees. On the other hand, the cost of maintaining parking facilities, malls, sidewalks, public toilets, service facilities and the like are included in the term "common area" when calculating the tenants pro-rata share of building operating expenses.