Development of the estate was gradual but particularly so on Great Portland Street. This had an effect during its redevelopment in the late-19th/early-20th centuries when rebuilding was dictated by the expiration of individual 99-year leases, and is evident in the buildings in existence today. The most coherent element to the architecture is the predominance of
Edwardian buildings to the north and
Victorian buildings towards
Oxford Street, particularly noticeable when there has been occasional consolidation of plots, leading to consistent façades above street level such as in the block between Clipstone and Carburton Streets. The trend of period groupings is another result of the slowness of the first development. As buildings in the south were built earlier than those in the north, their leases expired earlier, setting off a wave of redevelopment which meant that rebuilding in the south took place in the late-
Victorian era, whilst that in the north was delayed until the
Edwardian period.
The Blitz made it necessary for further re-building after the war, although the damage incurred along the street was not particularly extensive so there are few modern buildings, and although the aesthetic today is a jumble of architectural styles and eras, the overall feel is that of an historic street.
Development over time Maps from close to the outset of building help to identify the street's changes.
1746 (John Rocque's Map) :The southern end of Great Portland Street (then shown as Portland Street) has been built as part of the development begun by Edward Harley and Lady Cavendish. With the exception of small villages at Mary Le Bone and Tottenham Court, the rest of the area to the north of Oxford Street is largely open fields. To the south, the street patterns which were the inspiration for the new development of formal squares and streets can be seen in places such as Soho Square.
1793 (Richard Horwood's Map) :The street pattern of the whole area has been laid out almost exactly as it is today, with the appearance of Marylebone Road providing the northern boundary to the grid. Notable differences are the presence of Foley House where
Langham Place is today, and Portland Place shown in its original design as a close of grand houses. Also, the line of Great Portland Street has been established but the buildings at the northern end have not been built, a curious gap as the streets parallel have largely been built up at this stage. One other curiosity in the planning of Great Portland Street, which still remains today, is its abrupt widening just north of Clipstone Street. :The impetus for the social pattern of affluence to the west and poverty to the east which has long-defined the area has been established with the houses along Portland Place and west of there being much larger than those to the east. These houses, clearly designed for the gentry have their own individual gardens and frequently mews, whilst the houses along Great Portland Street and the surrounding streets are noticeably smaller and would have accommodated the working classes involved in local trades.
1827 (Christopher Greenwood's Map) :Great Portland Street's buildings are still not complete at the northern end, although the rest of the area's present-day street pattern is now completely in place. This includes the appearance of Park Crescent and the transformation of Portland Place into a grand parade with the disappearance of Foley House. These two prominent features were part of Nash's scheme for the Prince Regent when the land to the north was returned to the Crown. This included the laying out of Regent's Park, which had previously remained an area of fields, and the creation of a 'royal mile', beginning at Park Crescent and leading down to Carlton House in the south.
1870 (Ordnance Survey Map) :The whole street has been built up and is now united as one street under the name of Great Portland Street whereas previously it had gone by the name of John Street in the few blocks before Oxford Street and Portland Road at the north end. However, the slight widening of the street which used to mark the beginning of Portland Road is still visible at the corner of
Weymouth Street. This feature probably would have contributed to the very northern end of the street being more heavily trafficked in comparison to the middle stretch, as is still the case today. :There are signs of the demolition and rebuilding which was beginning to occur in this period and which continued through into the early years of the 20th century. The most noticeable evidence of this on the map is the large gap on the west side between Weymouth and New Cavendish Streets, where the modern synagogue is today. Otherwise, the street pattern and buildings remain largely the same in their layout.
1889 (Booth's Poverty Map) :Booth's map shows Great Portland Street and the immediately parallel streets as middle-class/well-to-do whilst the accompanying notes describe it as a "mixed st., shops, restaurants, many curio and antique shops, many doubtful massage establishments". This vibrant description indicates that it is already something of a local centre, with a distinct catchment area made up of those "comfortable" households in the neighbouring streets. The mixed nature of the street described by Booth is not surprising given the general picture this map gives. The movement from 'wealthy' to 'poor' – and even some 'very poor' households – is striking as one travels west to east from Harley Street and Portland Place to Great Titchfield Street and beyond.
1916 (Ordnance Survey Map) :The great redevelopment of this street has largely come to an end by this time. There are slight changes in some of the plots along the street, showing the further rebuilding and consolidation which had taken place in the previous few decades but otherwise, this street and its surrounding streets remain unchanged in their layout.
1945 (London Council Bomb Damage Maps) :A few buildings along Great Portland Street were destroyed by bombing which explains some of the modern developments such as the synagogue opposite Clipstone Street, which was originally built in the late 19th century but damaged beyond repair in
the Blitz. The street was cited in 28 separate
A.R.P. bomb incident reports dated between September 1940 and 1944. Despite this, much of the street escaped with little or no damage although there was some bad damage nearby in Langham Place and further east around Fitzrovia, with several buildings in those areas being completely destroyed or requiring demolition. ==Broadcasters and media entities==