Hi hansolo_506!
You obviously got a good eye to detect good things. The kit you were asking about is a Vollmer kit. To me, Vollmer is the manufacturer of the most delicate and perfect kits with wonderful details.
Your kit is Article H0 3777 "Schlosshotel". You can find the complete range of Vollmer kits in their website:
Vollmer - Architektur in Miniatur
Other brand which is very good, but to me a small step behind in perfection as compared with Vollmer, is Faller, whose website is
www.faller.de
I just joined thewhistlepost site cause I came across with your photo while performing image searching with Google.
Anyway, I hope you can find the Vollmer kit, I don't know if it's still in their catalog, but I'm sure that otherwise you could find it with an internet retailer.
Good luck!
I'm Horacio, from Buenos Aires, Argentina, South America.