Hyrule Castle - It's in the northern most point on TMC's map in a similar position to where it is in Ocarina of Time. Again, it indicates it happens in the same era as Ocarina. However, Lake Hylia's location and the lack of a desert in the west indicate that considerable time passes either before or after Ocarina of Time. And since the desert exists in Twilight Princess and ALTTP, the survey says "before".