You are looking at a Lionel 6-12951 Airport Hanger Building kit O/027. This is a neat KIT, a little more detailed and involved than the traditional Plasticville-type kit. It makes for a very nice building in O scale for your Lionel layout.
This one is still in the original box with the contents still sealed. That is how you want your kits! And it has the original instructions, too. There is a small tear in the plastic around the box.
NOTE: This is a kit you will need to put together.