The LAC reopened on Tuesday. Their web site states "All public research areas are open; however, some minor work must be carried out to complete the renovations. This may cause some disruption to different service areas over the next few weeks."
I haven't been in to see the reorganized floors, but understand from a regular user that a lot of material is no longer where it was. There is a lot to relearn. Not all the equipment is operational, and there is still considerable work to do over the next months until the physical facilities are complete. Returning visitors should plan on spending extra time to learn the new layout. If your visit is not essential you may want to defer it until things are more settled.