Excerpt from en.wikipedia.org/wiki/Middelburg_Abbey:
Choir church (Koorkerk)
Around 1300 the abbey's old church building was replaced with the Choir church (Koorkerk), which is physically divided from adjacent New Church. The church comprises a tall chancel of seven arches in length, with a five sided apse to the east of the choir stalls. As part of the rebuilding after its destruction by fire in 1568, elaborate roof vaulting was added.
A prominent feature of the town's profile is the abbey church tower known as "Lange Jan" ("Tall John") on the south side of the Choir church. The lower part of the tower dates from the fourteenth century. The more elaborate higher parts were added in 1712 and then reconstructed following the destruction of 1940.