Is there a city trying to build a sky scrapper that will out do the burj in dubai

Yes, Dubai again!

1) "Current records
Tallest structure: 818 m (2,684 ft) (previously KVLY-TV mast - 628.8 m (2,063 ft))
Tallest freestanding structure: 818 m (2,684 ft) (previously CN Tower - 553.3 m (1,815 ft))
Building with most floors: 160 (previously Sears Tower / World Trade Center - 110)
World's highest elevator installation
Worlds fastest elevators at speed of 60 km/h or 16.7 m/s (55 ft/s)
Highest vertical concrete pumping (for a building): 601 m (1,972 ft) (previously Taipei 101 - 449.2 m (1,474 ft))
Highest vertical concrete pumping (for any construction): 601 m (1,972 ft) (previously Riva del Garda Hydroelectric Power Plant - 532 m (1,745 ft))
First world's tallest structure in history that includes residential space.

Note: Additional records for tallest skyscraper are considered unofficial. On 20 July 2007, the head of the Council on Tall Buildings and Urban Habitat (CTBUH), Antony Wood, said "We will not classify it as a building until it is complete, clad and at least partially open for business to avoid things like the Ryungyong [sic] project. Taipei 101 is thus officially the world's tallest until that happens.""
Source and further information:
http://en.wikipedia.org/wiki/Burj_Dubai


2) "== Tallest skyscrapers by architectural detail (top 200) =="
"Rank Building[A] City Country Height Floors Built
1 Burj Dubai Dubai United Arab Emirates 818 m 2,684 ft 162 2009"

"Many skyscraper aficionados prefer height to roof to determine tallest building in the world, as "architectural feature" is regarded as a subjective and less-fair measure."

"Rank Building City Country Height Floors Built
1 Burj Dubai Dubai United Arab Emirates 642 m 2107 ft 162 2009"

"Height to Pinnacle
Some skyscraper enthusiasts prefer this measurement, claiming that the extensions that can or cannot be deemed "architectural" are subjective. However, many non-architectural extensions (such as radio antennas) are easily added and removed from tall buildings without significantly changing the style and design of the building, which is seen as a significant part of the value of these buildings. Also, measurement (to the top of the highest architectural detail) has been the one traditionally used for decades for this and other reasons; the pinnacle category has only recently come into use, starting during the construction of the Petronas Towers.
This measure is the value listed in lists of air traffic obstacles and similar lists.
Rank Building City Country Height Floors Built
1 Burj Dubai Dubai United Arab Emirates 818.0 m 2,684 ft 162 2009"


"Skyscrapers under construction"
"Name Planned pinnacle height Planned roof height Floors Completed Country City Remarks
Shanghai Tower 632 metres (2,073 ft) 565.6 metres (1,856 ft) 127 2014 People's Republic of China Shanghai"

"Skyscrapers on-hold

This list ranks skyscrapers whose construction is on-hold that are planned to rise over 300 metres (984.3 ft).
Name Planned pinnacle height Proposed completion Country City
Nakheel Tower 1,400 metres (4,590 ft) 2020 United Arab Emirates Dubai"
Source and further information:
http://en.wikipedia.org/wiki/List_of_tallest_buildings_in_the_world


3) "Nakheel Tower (برج نخيل) is a supertall skyscraper proposed for construction in Dubai, United Arab Emirates by developer Nakheel. The project was previously called Al Burj (Arabic: البرج‎ "The Tower"). It has been announced that construction is currently on hold, and further work on the tower's foundations will begin around January 2010.

Nakheel is in talks with several potential contractors which include Samsung Engineering & Construction (who are also building Burj Dubai), Japanese Shimizu Corporation and Australian Grocon. WSP is Lead Consultant for the structure, heading a consortium that includes LERA of New York and VDM of Australia, and working with architects Woods Bagot. The proposed tower would be 1,400 m (4,593 ft) tall."
Source and further information:
http://en.wikipedia.org/wiki/Nakheel_Tower