Construction progress continues on the 400 Lake Shore North Tower at the old Chicago Spire development site in Streeterville. Now that the Spire cofferdam has been filled in and excavated, it’s hidden from sight as the tower’s lower floors come into view. Amidst a sea of rebar, the ramp down to the lower parking levels is visible, and there’s a glimpse into the lowest two levels of sub-basement, while the rest of the site has grown even in height to the top of the concrete core.