Those look like the ones often planted in road medians and around shopping centers here. They seem to stop growing at about 18 - 24 inches.
I was given a Bottlebrush, variety unknown, several years ago; it topped out at about 6' and then was killed by the terrible winter of 2020. However, I won't miss it much as it bloomed sparingly and grey! A slightly pinkish grey but not attractive.
