L.A.
Blocks, cars, legos, boxes all shapes and sizes taped so he can use them as GIANT blocks. Wooden Train set.
I gave our nephews a wooden box that had all kinds of different latches and locks.. they loved it..
Pop up tents. I used to let our daughter use every pillow cushion and blanket in the house to build forts in the living room.
A giant refrigerator box with holes cut out like windows.. Laundry basket to pretend it is a car or train.. Toy grocery cart with play food, and cash register.
A toy work bench.