A woman seeking a room for rent online has been left shocked after her prospective new roommate listed one very bold condition - being 'flatmates with benefits'.

Brazen messages posted to Facebook show the man outlining the rules for co-renting his apartment, located in the affluent north Sydney suburb of Mosman.

But while conditions like 'females only' or 'no couples' are common when leasing a room, it was this man's attempts to force a relationship that has divided social media.

A woman seeking a room for rent online has been left shocked after her prospective new roommate listed one very bold condition - being 'flatmates with benefits' (pictured)

Brazen messages posted to Facebook show the man outlining the rules he has for his apartment (pictured), located in the affluent north Sydney suburb of Mosman

Messages shared to a popular Facebook group show the man outlining the unusual rule at the outset of his conversation with the woman.

'The room has been out for two weeks now (and) no one has come to see it because I have a very bold condition,' the man writes.

'Okay, what is the condition?' the woman replies.

'Flatmates with benefits,' he says.

Clearly not sure how to take his proposition, she asks the man if he is being 'serious' before telling him his offer is better suited to Tinder.

But the woman wasn't the only one left angered by the man's gall, with commenters on Facebook similarly outraged.

Social media opinion was divided, with some labelling him a 'creep' and others applauding him for being 'upfront' and 'honest'

'Name and shame the creep,' one user wrote, who got a lot of support from others.

But not all believed the man had crossed the line, with others saying his actions were not inappropriate at all.

'How is he a creep? He was straight forward, upfront and honest,' one man wrote.

'If he wants to "rent" it that way, let him do whatever he wants - he didn't trick you or anything, he said upfront what he expects,' another said.