Question: How big the city MediaCityUK which has a swing-mechanism footbridge?

Context paragraphs:
Deadwood, British Columbia: Deadwood is a ghost town in British Columbia.  Deadwood existed in 1897 and was located several miles west of Greenwood, between Grand Forks and Osoyoos.  A number of copper claims in the area gave rise to Deadwood.  The copper claims include Big Ledge, Eagle, Butte City, Spoiled Horse, and Mother Lode.  The Mother Lode became a great mine although Deadwood disappeared within a few years.  Deadwood contained two hotels, a store, a post office and a school.  Traces of the Algoma Hotel may still exist, although the town of Deadwood has disappeared.

Big Salmon River Suspension Bridge: Big Salmon River Suspension Bridge is a suspension footbridge in New Brunswick, Canada.  It measures 84m in length.  It spans the Big Salmon River (New Brunswick), a small river which flows into the Bay of Fundy near St. Martins, New Brunswick.

Media City Footbridge: The Media City Footbridge is a swing-mechanism footbridge over the Manchester Ship Canal near MediaCityUK.  It is an asymmetric cable-stayed swing bridge.

MediaCityUK: MediaCityUK is a 200 acre mixed-use property development on the banks of the Manchester Ship Canal in Salford and Trafford, Greater Manchester, England.  The project was developed by Peel Media and its principal tenants are media organisations and the University of Salford.  The land occupied by the development was part of the Port of Manchester and Manchester Docks.

Two Cent Bridge: The Ticonic Footbridge, popularly known as the Two Cent Bridge, is a suspension bridge that spans the Kennebec River between the city of Waterville and the town of Winslow in Kennebec County, Maine.  It is one of the oldest surviving wire-cable steel suspension bridges and also is considered to be the last known extant toll footbridge in the United States.

Salford Quays lift bridge: The Salford Quays lift bridge or Salford Quays Millennium footbridge is a 91.2-metre long vertical lift bridge spanning the Manchester Ship Canal in Salford, Greater Manchester, England.  The bridge, which was completed in 2000, is near the terminus of the ship canal at the old Manchester Docks.  It links Salford Quays to MediaCityUK and has a lift of 18 metres, allowing large watercraft to pass beneath.

Holzbrücke Rapperswil-Hurden: Holzbrücke Rapperswil-Hurden is a wooden pedestrian bridge between the city of Rapperswil and the village of Hurden crossing the upper Lake Zürich ("Obersee") in Switzerland.  The prehistoric timber piles discovered to the west of the Seedamm date back to 1523 BC.  The island settlement "Technikum" is a prehistoric pile-dwelling (or stilt house) settlement which is part of the UNESCO World Heritage Site "Prehistoric Pile dwellings around the Alps".  The first wooden footbridge led across Lake Zürich, followed by several reconstructions at least until the late 2nd century AD when the Roman Empire built a 6 m wide wooden bridge.  Between 1358 and 1360, Rudolf IV, Duke of Austria, built a 'new' wooden bridge across the lake that was used until 1878.  On 6 April 2001, the reconstructed wooden footbridge was opened, being the longest wooden bridge in Switzerland.

Mosley Street tram stop: Mosley Street was a tram stop in the City Zone of Greater Manchester's Metrolink light rail system which closed on 18 May 2013.  It was located on Mosley Street in Manchester city centre and was unique to Metrolink in that it was unidirectional, with a single platform serving southbound passengers travelling towards Altrincham Interchange, Eccles Interchange, MediaCityUK and St Werburgh's Road only.

Big Spring Historic District: Big Spring Historic District is a national historic district located at Van Buren, Carter County, Missouri.  It encompasses 26 contributing buildings, 1 contributing site, and contributing structure in the Ozark National Scenic Riverways.  It includes the Big Spring, rental cabins, service building, storage shed, garage, a museum, dining lodge, restroom, shelter house, ranger station, pump house, footbridge, and two picnic shelters.  The structures represent the best features of park construction by the Civilian Conservation Corps in Missouri.

Eiserner Steg: The Eiserner Steg ("Iron footbridge", "Iron bridge") is a footbridge leading over the river Main in the city of Frankfurt, Germany, which connects the centre of Frankfurt with the district of Sachsenhausen.  The first bridge of wrought iron was built in the year of 1868.  It was replaced in 1911/1912 by a slightly larger cantilever bridge.  It is 170 metres long and consists of riveted steel truss with two bridge piers.  The bridge was blown up by the Wehrmacht in the final days of World War II, but it has been rebuilt shortly afterwards in the year of 1946.  In 1993 it had been fully renovated.

Supporting paragraphs: Media City Footbridge MediaCityUK
Answer: 200 acre