A sink shelf assembly that includes a first shelf member configured to mount underneath a sink and comprising a front surface, a back surface, two side surfaces interconnecting the front and back surfaces, and a recess extending inwardly from the back surface between the two side surfaces; and a second shelf member removably received in the recess of the first shelf member in a coupled position and removed from the recess in a decoupled position to allow routing of plumbing through the recess without obstruction from the first shelf member.