Olomouc – is also know by the German name of Olomutz and did have a German majority. The problem I have is pinpointing down the specifics of the Trinity column. It is widely publicised as being Moravian Baroque and it was a point of principle that only local Moravian Artists were used, but obviously the Moravia of this time was both a Czech and German place that is not so useful. However the two main sculptors are usually refereed to as Czech artists and are most commonly known by their Czech names Ondřej Zahner & Václav Render, though occasionally they are referred to by Germanised versions of these names (Andreas and Wenzel) but this seems to be mostly for ease of pronunciation than because that was the preferred name.
I know it is tough to define what community builders belonged to some 260 years ago but I would be sceptical about classing it as being 'built but Germans' unless there is any particular evidence linking it to specific members of the German community especially as there was a big point of principle in making this a 'Moravian' venture. Although in saying that there are many fine buildings through out the city, which were certainly, linked to the German community.
Lednice- Valtice - was built by the Liectenstein family just to throw another german speaking country in the mix
Tugendhat villa - Mies was German, and I think the Tugendhats were German Jews