The building is part of the old garrison at Shoebury, it used to be married quarters. Because of it's resemblance to a Victorian Birdcage it was known as the 'Birdcage Quarters'. It was built around 1854 along with the rest of the garrison. The garrison was closed around 1984 and the Birdcage Quarters are now private flats.
There are some wonderful old buildings around the garrison to photograph. Unfortunately those modern day legalised vandals, property developers, have recently bought the garrison from the MOD. They are now busy 'enhancing the living experience' by building hundreds of new homes and 'business developments' (in other words bloody ugly factory buildings) on any open space left in the garrison, including the old Gunners Park, which was ancient meadow and marsh. The area has been completely ruined (IMO).
Property developers should all be taken out and shot.
Here are a few quick neg scans of the garrison (please excuse the poor contrast quality, I'm crap at image manipulation!):
...and most disgusting of all, the developers have turned the beautiful old garrison Church into a marketing suite (complete with fibreglass cannon):