in by Reuterweg, the Bockenheimer Anlage at the Opernplatz, the Taunusanlage, Mainzer Landstraße up to Platz der Republik, Friedrich-Ebert-Anlage, Senckenberganlage, a small piece of Zeppelinallee, then from the southern boundary of the Palmengarten, Siesmayerstraße, Grüneburgweg up to its bend in the south east and Fürstenbergerstraße to the corner of Reuterweg. The official urban districts of Frankfurt are not covered completely by these borders. According to these the whole Messe (fair) grounds, except in the west border area of Bockenheim and in the east of the district up to Eschersheimer Landstraße, also belongs to Westend. Townscape Skyscrapers in Westend-Süd The western part of the Innenstadt, the eastern part of the Bahnhofsviertel and the southern part of the Westend form Frankfurt's central business district, the Bankenviertel. The concentration of skyscrapers here is higher than anywhere else in Germany. The skyscrapers which are located in the Westend line up from the Bockenheimer Anlage via the Taunusanlage and Mainzer Landstraße to Platz der Republik. From east to west along this stretch are the Parktower (115 m), the Opernturm (170 m) the Deutsche Bank Twin Towers (each 155 m), the Trianon (186 m), the Frankfurter Büro Center (142 m), the Westend Tower (208 m) and the City-Haus (142 m). There are more tall buildings at the Messe grounds: the world-renowned Messeturm (257 m, the tallest skyscraper in Europe between 1991 and 1997), the Westend Gate (159 m, the tallest skyscraper in Germany between 1976 and 1977). Infrastructure Traffic As a predominantly residential area the Westend mainly has narrow roads, which are calm in relation to traffic. Apart from a few exceptions all the roads are one-way streets, which change directions at cross roads. Therefore, the Westend is much loved by driving schools. The exceptions are streets which lead out of the Westend borough into other parts of the city. Initially these streets are Eschersheimer Landstraße, the Anlagenring and the Alleenring, which carry a majority of the rush-hour and Messe traffic. Other important traffic-bearing streets are Bockheimer Landstraße as the main street to the Messe lying in an east-west direction, and the fairway made up of Reuterweg, Bremer Straße and Hansaallee as an arterial road in the North and Grüneburgweg as another east-west connection. Apart from that Grüneburgweg is also the Westend-Nord Westend-Süd border. The Westend was one of the first boroughs with a connection to the tram network. In those days the main route lead