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I agree that the lens is most susceptible to flare when the light is at the edge of the lens, but flare can also occur when the light is within the frame. I suspect that this flare is coming from the lights at the top of the image. A different lens may be less susceptible, especially if it is a newer lens with modern coatings, but not necessarily. I don't know which 35mm lens you are using. You could preview the image in live view at the chosen aperture to get a heads up on it. Then again, it's not so bad and could be easily cloned in Photoshop.