Rent control

Right, in plain English

Local rules that cap how high rent can be set, or how fast it can climb, and they exist in some cities and not others. Where they apply, an advertised price can actually be above what the law allows. Index-linked rent is a different mechanism, where increases are tied to an official inflation figure rather than capped outright.

Someone signs a lease in a rent-controlled city and only later learns the landlord was charging above the legal ceiling. Because the local rule was on their side the whole time, they had grounds to challenge the amount and claw back the difference, if only they had known to look.

Why it matters

Where it exists, an advertised rent may actually be above the legal cap, giving you grounds to challenge it, and increases during your tenancy may be limited. Not knowing the local rule means paying more than the law allows or missing a right to push back.