From “The Shaping of Things To Come” by Frost & Hirsch:

“If we’re living holy lives, praying for not yet Christians friends, socializing regularly and building friendships with them and introducing them to our evangelist friends, we will be creating the fertile soil for God to do his exclusive work, giving people the gift of faith. This is the incarnational approach to outreach.”

If we do this the church has in fact left the building and the building is not the problem. If we are not doing this, it is not the building that is stopping us.