The Pioneer building was built in 1889 and housed the Pioneer Press Newspaper. The building to the left in the picture is the Endicott building.
You can see the construction as you walk by the Pioneer Endicott buildings and you can see it in the skyway. The spaces are being converted into apartments and retail space.
The Endicott building was built in the 1890 and designed by Cass gilbert.
The buildings are connected and on the national register of historic places.