By "old " they mean the ones that sit in the best and most expensive land ,don't belong to Society and are easy to sell .The congregation of that Hall will have to relocate to a nearby converted garage that they will have to refurbish free labour and will have to pay to the Society .
4 THINGS ACHIEVED in one move :
1. Grabb all cash held in the old congragation's accounts and dismandle.
2.Sell prime land and building.
3.Get them to build a new building from scratch with their free labour a building that won't belong to them.
4. Get them to sign a loan to the Watchtower for the priveledge of using this building.
5. 10-20 YEARS down the line REPEAT 1-4
6. Who said religion isn't a lucrative business?
Oh ,did I forgot to mention ? Call this a blessing from God!