I don't want to look like Bratwurst in different debate when he realised that Reichstag had been build by Pole he argued that it was rebuild and now it is "true" German building... but I don't agree with statements suggesting that folk culture is true Polish and all european trends like Renaissance, Baroque or something like that are not true Polish because came from Italy ... and were brought by somebody.
Now we are going to have new eco-style...noticable in whole world.
Edward Konieczny is nominated to Mies van der Rohe award 2009.
As to German influences (If you work in this industry you should know wallpaper magazine):
Is Warsaw the new Berlin?
Aatrial House, built for a family of three, rises from a beautiful open site not far from Opole in the Southern Polish region of Silesia.Aatrial house. Robert Konieczny
It is polish architecture but it is part of worldwide trend.
No but as you have quoted the renaissance began in Italy, they had top architects come from Italy to Krakow to do it here.
In 16th century Poland was one of the richest countries in Europe so there was many Scots or Italians immigrating to Poland.
I am not specialist in Kraków's architecture so I am not going to discuse the history of buildings you have posted.
As to Poznań Old Market has been build long before strong influences you have mentioned.
Poznań's Town Hall (Ratusz) was first documented in Latin in 1310 as Domus Consulum. The building was completed in 1300 during the reign of Wacław II Czeski. It was a one-storey building built upon a raised quadrangle..