San Francisco is one of those enchanting corners of the world that draws visitors and residents alike. If you’ve ever been, you get it. The city’s endless charms make it a highly desirable place to live. So for all you wannabe-locals, here are three tips for buying real estate in San Francisco. Need to Know A few quick, useful facts about the city: It’s the second most expensive in the country, which is likely why it ranks third in the country …