We quickly realized that our existing rabbit pen wasn't going to work for the trio. It was a 4x4 ft dog exercise pen set on a vinyl wrapped piece of plywood. We decided to give them the back part of the basement walkout. The pen stretches nicely across the area, so we didn't have to buy another pen.
This space is almost 13 ft across and 9 ft deep at the narrow end. The door leads into the bathroom, which has two doors. The pen has a gate, so we can easily let them out into the rest of the walkout.
This is the vinyl wrapped piece of plywood. You can see how small it is for three rabbits!