Kingdom Hall of Jehovah's Witnesses is Oliver is a very plain building typical of most their building. It is without windows in keeping with their beliefs.
"Jehovah's Witnesses is a millenarian restorationist Christian denomination with nontrinitarian beliefs distinct from mainstream Christianity.[5] The group reports a worldwide membership of approximately 8.68 million adherents involved in evangelism and an annual Memorial attendance of over 20 million.
Source:
Wikipedia