From what I understand, the mindset within the organization has always been that WTS owned property would make it through Armageddon. A somewhat pointless belief, given that an omnipotent Jehovah could keep any structure he wanted to remain for his people.
Nevertheless, The feeling that what the JWs 'own' would make it through no doubt was always the internal fallback for why it was ok to keep purchasing and building. A move they greatly benefit them now, given how common it is for the worlds billionaires and millionaires to safeguard their money in an ever growing NYC real estate boom.