This is the magnificent Trinity Guildhall in Kings Lynn, dating from 1420.
The chequer board frontage consist of squares of flint stones, (several in each square), and square blocks of sandstone. It extends a long way to the left of this shot too, but I have tried to get in reasonably close to bring out some of the detail.
In 1624 the Jacobean Porch was added and the Queen Elizabeth Coat of Arms was brought from another building and placed above the twelve light window. In 1664 Charles II Coat of Arms replaced that of the Commonwealth which had already repalced that of the Stuart Kings.
There have been many changes since, far too many to list here.