In Ohio, it’s not uncommon to find Native American artifacts and bones when digging down. Indians lived in a lot of the same places settlers moved to. Typically, interesting artifacts (mostly arrowheads) are pocketed and other remains go into the fill. It’s rather sad, especially since the more obvious sites were looted and plowed over in the 1800s.
The Huffpo article linked a few posts above says the skeleton was ‘pretty tall for the time being around 6ft or so’. If the archaeologist in the pictures is who I think he is, I’ve met him and he’s probably around the same height, maybe an inch or so shorter.
And the carpark wasn’t a public carpark; it probably used a ‘permit holders only’ system, with occasional checks for illegally parked vehicles. Unless you worked/studied there, you probably didn’t even know there was extra parking around the corner!