The Andover Marketplace development near Kellogg and Andover Road is ready for expansion. That's why Vantage Point Properties Inc. has started to more aggressively market nine available pad sites within that development. I reported Tuesday that Vantage Point has enlisted the help of J.P. Weigand & Sons Inc. to help market those parcels. Paul Jackson, president of Vantage Point, says the August completion of the 208-unit SunStone Apartment Homes complex and the planned expansion of the sports facilities…