I don't know who told you that, but it was just that a story, and a tall one at that. The park bought the business that owned the land on the river. The idea was to give more river access. Then they decided that there weren't enough canoe outfitters on the river. So the concessionaire started a canoe rental. with the exclusive use of the ramp. They them decided that having people camp near the stream was also bad, so they moved them to the ridge top. They then decided that given the fact that not everyone didn't camp and that some poor souls had to outside the park for lodging that it was only right that the park build condos and cabins, near the stream. The park was lucky that they had had a concessionaire in place since the early 80's and so he was given the extra , err, responsibility of running the canoe rental, the lodging and the store. I almost forgot, the tags also.
Lease? No the store has been on a "cut" and I assume the same set up is probably followed in the other state endeavors. Obviously, if the DNR wasn't doing this there would be no canoe rentals, lodging, or fly shops in the area.