RE:Cost-benefit analysisA logger who can't see the forest for the trees!!!!....Canada maintains SIXTEEN consulates in the US. The US maintains EIGHT consulates in Canada. 150 countries maintain consulates in New York City. All of that in nothing new and has been the case for what I'll guess is most of the last century and the present one.
Sell the old digs for 13M...buy (downsize) new digs for 9M ? What IS your beef?
https://www.ctvnews.ca/politics/canada-lists-old-nyc-residence-for-13m-surpassing-cost-of-new-luxury-condo-1.7002656