Abstract: An adjustable height table base assembly includes two or more leg assemblies each including a mobile leg member, a stationary leg member, and a linear motion system. The mobile and stationary leg members are each formed of a flat vertical support structure. The leg assemblies are configured to extend and retract to adjust a height position of the mobile leg member and any table top secured to the mobile leg member. The mobile leg members slide in a parallel direction in relation to the stationary leg members by means of linear motion systems. The power mechanism for the adjustable height table may comprise a counterbalance mechanism or one or more electric motors. Optionally, each of the leg assemblies also includes a non-load bearing cover enclosing at least a portion of the mobile leg member and at least a portion of the stationary leg member.