Grand Exchange is located next to a Xenon sector, and in those sectors you will get random (but infrequent) invasions comprising a P, several M3', M4's and M5's. There is also the Pirate Galleon (and pals) wandering around.
So, your intuition the SY was destroyed is probably correct. However, the Teladi will build another SY to replace it - although that may take some time.
In XTM, though, it is my understanding that each race's stations will be purchaseable from at least 2 of their SY's. If you look through the stock of other Teladi SY's you should find the Typhoon factory available. For reference, the Teladi have SY's in Seizewell, PTNI Headquarters, Grand Exchange, Ianamus Zura, Ministry of Finance and Further Wealth.