AN INCREDIBLE five-bed mansion has gone on the market – but house hunters have to be prepared to accept a non-negotiable quirk.

The extraordinary property has now been dubbed a "serial killer's home" due to the terrifying clause in the purchase agreement.

Potential buyers have been warned there is a controversial freebie that comes with the deal – a mystery person living downstairs.

The property in Fairfax, Virginia, boasts four bathrooms, large living areas and a huge garden for just $800,000 (around £615,000).

Nestled in a quiet cul de sac, the grand five-bedroom pad is in need of some TLC.

But you'd need to be mindful of your neighbours – and tenants – when renovating the home.

There is "no access" to the lower level of the mansion, as there is a person living downstairs, without a lease agreement.

The bizarre listing on Zillow read: "CASH OFFERS ONLY AND NO ACCESS to see lower level and home sold AS IS ONLY with acknowledgement that home will convey with a person living in lower level with no lease in place."

To make matters even stranger, the sellers explained that the powder room toilet is shut off as it "leaks into the lower level".

Instagram users were left horrified by the spooky resident camping out downstairs, while others were concerned they may be soaked by the flooding from the bathroom.

One commented: "800k for 5 bd, 4 ba, and your own serial killer."

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Another added: "You're telling me I can sell my house for CASH and still live in it rent free? SIGN ME UP!"

A third joked: "They really said Mystery Basement Goblin NOT sold separately."

While a fourth user chimed in: "On the next season of NETFLIX’s MYSTERY TENANT."

The wacky listing caused a stir on social media after it was shared by ZillowGoneWild, an account dedicated to sharing the craziest homes on Zillow.

We previously told how a six-bedroom home in Missouri went on sale for a whopping £2.2million – with a terrifying secret thrown in for free.

The expensive property is littered with native American mementos and a haul of peculiar hunting decorations.

Potential buyers will be saddled with an eclectic mix of animal fur throws and taxidermy.

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And this sprawling farmhouse on the market for £1million is also hiding a sinister secret.

Tower Farm in Llangollen,Wales, was the scene of a horrific double murder when an elderly widow and her pensioner friend were killed in a knife attack.

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