The accommodation for clergy which is generally the second biggest property in the parish after the local gentry/land owner. Built not due to need but to show "importance".
The accumulated wealth has not been due to free giving.
But the church is/has been driven by wealth. To do real good it could use its own money.
Don't mind Cameron playing at being a "Christian" as many have to in such positions. However it becomes dangerous when irrational beliefs influence major decisions, such as Blair, God and Iraq.