I'm going to assume you are not a troll or spammer.
7kg is going to be an expensive bike: you will probably have to buy a carbon frame. most brands used in pro racing are sold in sizes appropriate for you (52-54 could fit) and you can ride those even if you are not a pro, or a man (hell yeah).
you could also try a folding bike such as a bike friday for transporting in your car and elevator*. They are a bit heavier than 7kg. But I hear they ride like "big bikes".
*i don't know about your elevator but my normal-sized bikes all fit into ours... if you transport them upright!