A provision that could extend rent control to communities outside of the New York City metropolitan area has gained steamed in recent days as lawmakers seek an extension and strengthening of rent regulations in the state.

The proposal would require a double layer of opt in — both a county and municipal government would have to affirmatively back the creation of a board setting rent regulations. Communities with a vacancy rate of less than 5 percent would be eligible.

A source on Monday said the measure was “moving in the right direction” as part of the broader rent control discussions. Rent control expires this month.

But for Democrats, the question will be how expansive the new laws will be, given Democratic control of both chambers of the legislature for the first time in 10 years.

Housing advocates are seeking the approval of nine different bills they say provide needed tenant protections. Still, one measure, a “good cause” eviction provision meant to guard against “unconscionable” rent increases, remains up in the air amid concerns from lawmakers about its effect.