On April 9th. 2015, the 4th. IoT, Built Environment & Smart City conference, now organized as a MeetUp, was held in Rotterdam, this year back on its original location, i.e. V2, Institute for the Unstable Media. Besides a fine line-up of speakers, among which Nimish Biloria (TUD-Hyperbody, Ben van Lier (Centric), Jan Belon (Buitengewone Zaken) , Floris Schiferli (Superuse), also one political party from Rotterdam (Nils Berndsen/D66) was present; which can only be admired, given the subject. Worthwhile in particular was the lecture (read by me due to her illness) from Cristina Ampatzidou; and especially the closing debate, moderated – like the whole event by Leon van Geest – delivered some interesting discussions and statements.