Roman London - the London wall
These pages are based on a "Royal Commission On Historical Monuments 1834" - actually it is 1928; which is in the public domain.
A mapping of the area is always good, modern day compared to pre-1900 maps from the NLS site
(8) . America Square. In 1908 the demolition of Nos 15 and 16 America Square, a short distance North of the piece last described, revealed a stretch of about 65 feet of the wall (Fig. 19), and a further special excavation was made to determine its character. Above the plinth it stood to a height of 7 feet and was 8 1/4 feet thick. The base was 16 feet below the street-level of America Square, The external face showed four courses of squared rag-stone above the plinth, followed by a triple bonding course, six courses of squared rag-stone and a double bonding-course. The internal face showed the usual offsets.
London Wall, America square
City wall and the ditch in America square
In 2019, America square, like most of the rest of London, has changed dramatically. This section of the wall is now inside a large conference centre.
One America square, London - in May 2019
If you peer into the floor level sky-lights down into the conference centre, you an just make out a section of the wall. this near to the corner of the building.
Here is a far better description, than I could ever envisage, with
lots of pictures inside the building, too.