Mayor Adams and Gov. Hochul, both of whom have popularity problems, are aligned on something fundamental: The long road to a more affordable city requires seizing ever more opportunities to produce housing, including housing that’s legally reserved for middle- and lower-income New Yorkers.

So give Hochul big credit for announcing plans to open up underutilized land at the state-owned Creedmoor Psychiatric Center for the construction of new homes. If this goes according to plan, on 58 acres where vacant buildings and lots and parking lots now sit will grow more than 2,800 places for people to live in Eastern Queens.

Included are more than 1,600 for-sale homes, townhomes and coops — and more than 1,200 rental units, including more than 800 units of supportive and senior housing. It’s not every last thing that the good folks at Queens Power, a coalition of residents that’s fighting to improve their neighborhoods, are asking for, but it’s pretty close.

Hochul retreated on a major pro-housing policy plank, but with this stroke, she proves that she’s not backing off new housing production. Fifty-eight acres is an unthinkably large property in this city, an opportunity that must finally be seized after decade after decade of swings and misses.

If a wand could be waved and all the new bedrooms and kitchen and bathrooms could just appear, we’d be thrilled. It’s never that easy, of course, especially not in New York. While construction itself takes a long time, it’s the drawn-out period between hopeful blueprints and actual on-site work that can feel interminable. 

The governor’s master plan speaks to the environmental review process, saying, “It is anticipated that the proposed Plan would require an Environmental Impact Statement, and environmental reviews of this scale tend to take about 18 months but may extend to 24 months.”

And that’s not all: “Concurrent with the environmental review, Empire State Development will draft a proposed General Project Plan (GPP), which will put forth the essential terms of the redevelopment. Both the GPP and DEIS would be subject to at least thirty (30) day of public review followed by a public hearing and at least thirty (30) days of public review and written comment.”

Translation: Hunker down, because this could take a while, with those who oppose more homes on the land having plenty of opportunities to throw wrenches in the gears.

Some potential opponents have already laid down markers, saying they’re wary of “high-density housing” — apparently defined as more than four stories, who knows why — and worried about traffic. 

Much of Hochul’s proposed plan is in the 6-8 story range, which is just fine by city standards. Indeed, we count 17 stories in the bulky main Creedmoor building.

Albany ought to be, and supposedly is, systematically scouring all its vacant and underutilized holdings to see where it can invite new housing. New York City ought to be, and supposedly is, doing the same.

Some of the homes New York needs should arise by adding a building or two here or a floor or two there, or a granny flat in this or that garage or basement. Some of it will arise by finding large fertile plots like Creedmoor, Sunnyside Yards and Aqueduct.

Create more supply and rents will become more reasonable for longtime New Yorkers and those who aspire to come here.