This building gives a good vantage point of Taipei's most densely populated area.
YONGHE DISTRICT —I like this rooftop because the vantage point is really coo. There's a lot of buildings but they don't block the mountain backdrop. But accessing this rooftop will be quite difficult if you don't know anybody in the building.
In the shot you can see Hongludi Nanshan Fude Temple which is worth checking out. If you want to visit a night market nearby I recommend Lehua Night Market.