The skyline of downtown Boston could soon be getting a lot taller.
Zoning changes proposed for downtown, stretching from the Boston Common to the Rose Kennedy Greenway, would allow developers to construct new buildings up to 700 feet tall, or about 70 stories, in some areas. Closer to the Common, heights will be capped at 100 to 155 feet.
Currently, the tallest building in that area is Winthrop Center at 691 feet and 52 stories tall, which was completed last year…