We are looking for a sectional that will be the only seating in a 25 foot by 25 foot room. the unit it will be replacing is 149" x 149". we think we want a white or off-white leather that will also accommodate a large yellow Lab dog. You have some units that look close to what we are after, but it doesn't appear that we can add additional sections. Ideally, we would have more than one wedge section.