Small, medium and large. Hmm...
Step One: Build medium/large facility
Step Two: Consolidate congregations currently meeting in separate buildings to single more glamorous facility. Maybe even large enough for multiple congregations to have separate meetings simultaneously in the same facility
Step Three: Sell smaller buildings
Step Three: Make the rooms modifiable (like hotel meeting/convention rooms) so that the assemblies can be held in new facility
Step Four: Sell existing assembly halls
Step Five: Sell adherents on the increasing size of the organization even though growth has been stagnant.
Repeat