The Crooked House of Windsor has been an integral part of Windsorian life for more than 400 years.
http://www.thamesweb.co.uk/windsor/guildhall/guildhall01.htm

Original Market House built in 1592
Until 1592, on market days, local farmers met at the town’s original market cross, where Queen Victoria’s statue is currently located. In 1592, when Queen Elizabeth I was still on the throne, the original Crooked House of Windsor, known historically as Market Cross House, was built.

Rebuilt in 1687
In 1687, the council ordered this first Market Cross House to be demolished in order to build the neighbouring Guildhall. An acrimonious land dispute ensued. The council was ordered to rebuild Market Cross House and to make the Guildhall its present size. Market Cross House acquired its famous tilt due to the use of unseasoned green oak.

The Secret Passage
There is a secret passage to Windsor Castle, now blocked, from its basement. This is reputed to have been used both for the illicit meeting between King Charles and his mistress, Nell Gywn and for taking provisions to the castle kitchens.

What Was it Before?
It was originally a butcher’s shop; but over the centuries the building has housed many types of businesses. It has been a jeweller, a brewery, an antique shop, and a gift shop in the past. It has been a tea room for over 30 years.