Vintage stained glass discovered at Greenpoint therapy office

This therapist unlocked a piece of history.

Construction crews working on a refreshed storefront for a Brooklyn psychotherapy office discovered stunning, century-old stained glass that offers a sneak peek into Greenpoint’s past.

“I was totally blown away. It’s a huge unexpected gift,” Karen G. Costa, who has rented Brooklyn Psychotherapy’s office at 705 Manhattan Ave. for years, told The Post.

“I almost cried.”

The incredible find was made last month after Costa hired construction crews to revamp what she called the “ugly” Greenpoint storefront that made her therapy office look more like a jail cell.

She had hoped they would replace the corrugated metal and gates with wood paneling akin to a retro, but traditional therapy office — and was repaid with an even more vintage result.

Three separate panels stretch across the storefront windows in white, green and black glass, reading “perfumes,” “toilet articles” and “prescriptions,” as first reported by Forgotten New York.

The styled glass perfectly matches the massive “706” attached to its neighboring door that leads to the apartments above the therapy office that has been on display for decades — as well as the original drugstore sign that Costa’s landlord had stashed in the basement.

A 1940 tax photo shows the beautiful stained glass that once adorned a business by the name of John H. Wienholz’s Drug Store.

Archival newspapers show adverts for the shop dating as far back as 1920.

Wienholz made his own cough medication, according to Forgotten New York.

It’s not clear when the drug store shuttered, but a tax photo from the 1980s shows that an auto parts store had taken its place.

Several people have already tried to buy the incredible find off Costa and her contractors, with one person offering a wild $18,000 for the panels — but the therapist said it’s a finders-keepers situation.

“I want my patients to have a welcome space. It’s such a nice surprise,” the Greenpointer explained. 

She has restored the three small broken pieces, but said the glass, while paper-thin, is in impeccable condition.