Business Events Milan

We'd like to design the logo of the new Convention Bureau of Milan, a network which unifies all actors involved in the promotion of the city as a destination for hosting business events. We are implementing a rebranding of the network so the logo will be used in all promotional campaign and marketing activities (website, newsletter, events, trade shows etc). It should represent and identify the city, attracting event organizers. The colour of the official logo of the Municipality of Milan is red (see file attached) and it's very simple and elegant. We'd like to have a logo which reminds the official one but it's not the same. In attachment you can see 2 examples of other logos. An option could be having the official Municipality logo modified as you wish, or also having the skyline of the city in vector form wich include stylized Duomo, Castle and the new skyscrapers of Unicredit Tower and the 3 new buildings of Citylife. We would like to have the New and Old city together.