Police are negotiating with a man dangling off the roof of an apartment block after the shocking discovery of a woman’s body on Sydney’s north shore.

A pedestrian discovered the body of a woman, believed to be in her 20’s, directly adjacent to the building the man is now situated on.

Shortly after her body was found the man appeared on the balcony roof at the residential building.

Police are now trying to speak with a man taking refuge on the roof of an awning of an apartment building bordering the alley on Brown Street.

Exactly how she died remains unknown at this point as police continue to investigate her death.

After the passer-by contacted emergency services early on Monday morning (local time), police and paramedics arrived on the scene.

The body was found not far from a number of businesses and apartment buildings.

A NSW Police spokeswoman said the woman’s cause of death was not immediately clear.