thumb|right|a view north up great portland street from oxford street in london thumb|right|a view south down great portland street from the marylebone road great portland street is a street in the west end of london. linking oxford street with albany street and the busy a501 marylebone road and euston road, the road forms the boundary between fitzrovia to the east and marylebone to the west. in administrative terms it lies in both the city of westminster's marylebone high street and west end wards.city of westminster gis team, marylebone high street ward map (pdf), august 2007 http://transact.westminster.gov.uk/csu/general_purposes/2007/24%20october%202007/marylebone%20high%20street%20%20ward%20map.pdfcity of westminster gis team, west end ward map (pdf), august 2007 http://transact.westminster.gov.uk/csu/general_purposes/2007/24%20october%202007/west%20end%20ward%20map.pdf it is a notable east marylebone street. long sections of great portland street fall within two westminster city council areas of preservation (harley street conservation area and east marylebone conservation area).the street crosses two separate conservation areas. the designation influences how important townscape features are preserved and enhanced.city of westminster, conservation areas: a guide for property owners (pdf), november 2004 http://transact.westminster.gov.uk/spgs/publications/conservation%20areas.pdf great portland street was developed by the dukes of portland, who owned most of the eastern half of marylebone in the 18th and 19th centuries. it was first rated as john street in 1726. great portland street separates different areas with very distinct identities, such as the grandeur of portland place and harley street, and the artistic and independent areas of fitzrovia. the street has its own unique character, due in part of the unusual combination of small shops combined with the strongly rectilinear character of great portland street, which gives it a feeling not unlike parts of new york. ==historic influences== thumb|right|marylebone toll both on great portland street circa 1790 thumb|right|fields north of great portland street in the late 1700s different owners and interests influenced the initial development of the local area and have had a lasting impact on the street layout and character. edward harley â earl of oxford and mortimer, and married to lady henrietta cavendish â was responsible for the development of the portland estate, which commenced with cavendish square in 1717 and grew north and east. great portland street's 
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