The last part of the provincial slogan - งามน่ายลศูนย์ราชการ - claims that the central administrative building is "beautiful, worth looking at". However to me the province hall looks just like all the others, yet when researching for the article on Nonthaburi province some years ago I came across a site which claimed that the province hall was awarded by the Ministry of Interior as the most beautiful province hall once.
Peltophorum pterocarpum, which is both the provincial symbol flower and tree. When I visited there, it also had lots of billboards around there, the candidate lists and other announcements around the election for the provincial administrative organization (องค์การบริหารส่วนจังหวัดนนทบุรี). This local government entity sharing responsibility for the whole province with the province hall has its office next to the district office, but since I did not look for it nor with my limited Thai noticed it on the map at the entrance I missed to photograph that one.
สำนักงานเทศบาลนครนนทบุรี), followed by the district office of Mueang Nonthaburi (ที่ว่าการอำเภอเมืองนนทบุรี).
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The government center was opened in 1992, but from what I read already at the old location all these offices were in a single compound. Just a few months ago, this old building had been converted into the Museum of Nonthaburi (พิพิธภัณฑ์จังหวัดนนทบุรี), which from that review sounds like a very interesting place to visit. It is now definitely on my list of places to go next time I am in Bangkok.