[1] One of Eduard's elder brothers was Ernst Ezechiel Pfeiffer, who would be remembered for his support of a number of charitable foundations in Cannstatt [fr].
In 1869 he was one of the founders of the "Württembergischen Vereinsbank" (roughly "Württemberg Associated Bank""), and was largely responsible for its growth during the generally economically benevolent decades of the German empire period.
Inherited wealth meant that he was financially secure, and for the next few years he was able to live and work as a freelance writer, producing during the 1860s books reflecting his acute observations and thoughts on the Co-operative movement.
Above all, however, his contribution in respect of low-costing housing is reflected in the four large residential estates (see below) which resulted from his sponsorship of a partial rebuilding project in inner Stuttgart's between 1906 and 1909.
During the closing decades of the nineteenth century rapid industrialisation was accompanied by massive population transfers from the villages to the cities, which - not just in Stuttgart - led to urban overcrowding.
On 7 August 1866, with a group of friends and acquaintances that included the Stuttgart industrialist Gustav Siegle [de], the banker Kilian von Steiner and the lawyer Julius Hölder [de], he founded the national liberal German Party (Württemberg), with the presciently timed objective of promoting a German state led by Prussia.
Because of the way in which he lived out his charitable convictions, and in particular in recognition of his financing, over three years, of a project that involved rebuilding a large part of the city's "old centre" between 1906 and 1909, he was made an Honorary Citizen of Stuttgart in 1909.
Pfeiffer identified an urgent need for social reform, and saw a guided and targeted programme of self-help as providing an ideal route-map for it.
The most important of its socio-political, financial and organisational efforts took Pfeiffer and The Association into issues involving social housing for the rapidly growing city.
Frontages applied the neo-classical style of conventional middle class houses of the time, sometimes incorporating bay-windows, pediments and "half-timbered" features.
Hengerer also planned and managed other projects for Pfeiffer, including the Infant Clinic and "Single's Hostel" (both in 1910/12) and the redevelopments in the Stuttgart "old centre" between 1906 and 1909.
Apart from the Ostheim development (above) Pfeiffer's most extensive project was the "Altstadt renovation", undertaken between 1906 and 1909, for which he received honorary citizenship of the city.
The new buildings which replaced the old dilapidated structures were constructed in a fashionable style for urban residential and commercial use, not dissimilar in outward appearance to the late-renaissance frontages to be found in the heart of Innsbruck, Salzburg or Bozen (today, for English speakers, known as Bolzano).
The result was somewhat romanticised when viewed by purists as a vision of the past, but it was nevertheless neat and homely when compared to the old more genuinely late medieval streetscapes it replaced, and it corresponded with the ideas (at this time) of the hugely influential (in southern Germany) architect and city-planner, Theodor Fischer.