MetLife has nowhere near 1400 jobs in Troy / Rensselaer.
The 1400 is the total number of jobs (from multiple MetLife locations) that are getting moved to Cary AND Tampa. This was announced to people within MetLife GTO (IT and Operations) back on Nov 3 2017 via email followed up by multiple very brief teleconference announcement sessions also held on Nov 3.
Note that MetLife was not ready to announce this stuff on Nov 3 but they did so because they were essentially forced to. Multiple newspapers published articles about MetLife moving jobs to Tampa so MetLife had to tell its employees about this stuff on Nov 3. MetLife did not really want to tell its employees about this until after the holidays (i.e. Jan 2018).
News articles about jobs being moved:
(Nov 3 2017)
(Nov 6 2017)
Here is a news article from Oct 27 2017 about the third building: