THE BLACK FOREST MIX How do you follow your recent purchase of the FBI-invaded office building at 5050 Westheimer — you know, the former Galleria headquarters of that charmingly creative Stanford Financial Group? Black Forest Ventures — a Woodlands-based venture capital firm started by a member of the family behind the Bruker biomedical empire — has the answer: Go out west near Katy and buy Mustang Engineering’s 175,000 sq.-ft. office building in the Park Ten office park off I-10. Just add both to Black Forest’s growing potpourri of properties. Other holdings gathered by the company: Woodlands gourmet grocers Hubbell & Hudson; 3 Black Walnut Cafes in the The Woodlands, Sugarland, the Rice Village; a few Woodlands office buildings; numerous rental homes; and a 15,000-sq.-ft. hangar at David Wayne Hooks Airport in Spring. [Houston Business Journal]