The Washington Department of Transportation has outlined major road closure around the Southcenter mall during construction:

Southcenter Parkway (both directions) closed between Strander Boulevard and the west mall entrance
Klickitat Drive (both directions) closed between Southcenter Parkway and I-5 (southbound) on-ramp

I-5 (southbound) off-ramp is open during construction

I-5 (northbound) off-ramp (exit 153) to southbound Southcenter Parkway closed

Southcenter Parkway (southbound) closed between the north mall entrance and the west mall entrance

I-5 (northbound) off-ramp (exit 153) to northbound Southcenter Parkway is open during construction

Southcenter Parkway (northbound) from I-5 off-ramp is open during construction