I solved that joining a coworking space. It changed my life, made a lot of friends since we see each other everyday. We have coffee/lunch chats which lead to friendships.
The great thing about it is you get to choose the space so it can fit what you're looking for (quiet, programmer heavy, artsy, walking distance, with a cafeteria, next to the gym, etc), you also don't have the pressure of them being colleagues so your relationship can be about other things (sports, games, music, pottery, going out)