The use of video stock footage is not that common for an architectural visualization artist, but it’s never too much to get a free resource for future reference. An art director called Mitch Martinez just released on his web site an incredible collection of 1500 videos in 4k captured with a Red Epic camera. All material is available for free, and organized in categories to facilitate your access. Is there anything worth looking for architectural visualization? Sure! There is a category related to urban environments.
Even if you don't use it at the project itself, a video like this can make an intro to animations or other presentations related to architecture.