My last tip for creating well composed symmetrical shots is to have someone or something in the shot beyond just architecture. Much like Andre Benz demonstrated in their shot of DUMBO above, having the woman walk down the street adds a whole new dimension to the image. It feels more alive with her there. If you can head out with friends when you shoot (and they are patient) have them walk across streets, down alleyways, and stand in as a prop for you when need them. Make sure you return the favour though as it can be a bit of tedious process of trying to line them up properly with their surroundings. At least buy them a slice for the trouble after ;)
Here's some of my favorite shots that may seem unplanned or "lucky" but they are actually the result of numerous attempts of staging the right stride by, standing in the middle of the street, waiting for a stranger to walk in the perfect spot of the frame, and waiting for traffic or people to clear an area. With the tips of above, a little perseverance, and some patient friends - You can easily take shots like this with your own creative spin. The first thing you have to do though is just shoot it.