In the Seattle area, there is more than one KH with 5 congregations. The residential neighborhoods they are in must love that.
One thing to remember is that even churches have to "fit" in the places they are located. The more crowded they are making those halls, the more street parking happens. I know of a few places where the parking situation is tight, but neighbors handled it for a few hours a week when the streets got crowded because of a hall, but with them being used to "full capacity" it means that weeknights and weekends will be an unceasing parade of cars in particularly dense areas (like N. Tacoma and greater Seattle) Those halls were already an adjustment, but now, rather than a few hours a week, its like a full time commercial enterpise is going on in residential neighborhoods.
So, there is one more possible reason to relocate to more commercial areas BEYOND the payback when they close everything.