You might get some of that if rent is raised by percentage. When I started my current job my salary was an integer multiple of $10,000. I got a raise at the e

You might get some of that if rent is raised by percentage. When I started my current job my salary was an integer multiple of $10,000. I got a raise at the end of my first year that was an integer percentage (3%, IIRC) so my salary was then an integer multiple of $100. The following year I got a raise again (it might have been an integer percentage, I don't recall) and my salary was just some random-looking integer. Rent-controlled Berkeley apartments are allowed to increase rent by some fixed percentage, so maybe you can see this in your data? But I don't think the math would work out so cleanly.