Similar to car prices, we see the same mental rounding effect in rents. People will rent a home for $2100 or $2200, sometimes even $2150 for those truly dedicated to price finding, but hardly anyone rents an apartment for $2137. Source: my data for the city of Berkeley https://observablehq.com/@jwb/berkeley-rent-board-data#cell-...
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.