The mayor’s Rich Family Zoning plan is going to be a tough vote for a lot of the supes, particularly on the West Side, where taller buildings and more density are not terribly popular.

But it’s shaping up as particularly tricky for Sup. Myrna Melgar.

Melgar, who has generally won with progressive support, represents D7, which has a lot of single-family homes and a fair number of people who want things to stay that way.

She also represents part of the Inner Sunset, which has more progressive voters, and more renters, and parts of Irving and Judah streets that may see small business displacement if smaller buildings are torn down to put up bigger, more expensive ones.

And here’s the tough part: Melgar has introduced amendments to the Lurie plan, which have been accepted by the mayor, tha

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