A deep-pocketed company that’s less than two years old and based in suburban Westlake has been busily acquiring residential properties in Cleveland, primarily on the city’s West Side. And last week, the company, Sanctus Capital LLC, made its biggest purchase yet — a 5-acre parcel at 3400 Vega Ave. sold by Caraustar Recovered Fiber Group Inc. that was home to Leisy Brewing Co., once Cleveland’s largest independent brewery.