Tritax Big Box Reit Takeover Rumours (BBOX)

Doesnt look like BBOX made the FTSE 100 list. This is minorly irritating short term as it would have meant increased volume and price stability as trackers would be obliged to hold it. But... They are selling off non core so it would have dropped out again anyway so.... whatever! Looking over at Tritax EBOX - they are getting taken over. What alarms me here is that the takeover price is at a 14% discount to NAV. WHich indicates that the NAV was wrong. While I think the NAV was right - it is clearly not easy to flog off an entire portfolio of properties at NAV. Which does leave me to wonder why on earth they are surrendering to this takeover at all.