With thanks to Zoo Planckendael. The existing building being remodeled is the area at the top left, by the leftmost orange arrow. A very large structure is being newly constructed.
Next to the existing bonobo building being remodeled and renovated, a very large structure is being newly constructed. This sign indicates that the indoor space for the bonobos will increase five-fold and that Planckendael intends to double the group size to 30 (from the current 14).