Dan Cohen AUTHOR Washington County officially gained control of the former Fort Ritchie from a state-designated redevelopment authority Tuesday, the first step in its plan to revitalize the central Maryland site into an ambitious mixed-use development with academic, commercial, residential and recreational uses.Under its proposal to create Cascade Town Centre at Fort Ritchie, the county would act as master developer for the 591-acre property, reported the Herald-Mail. The town center would attract hundreds of millions of dollars in investment, create up to 1,000 jobs and expand the region’s population by about 3,000 residents, according to officials.“I’m hoping that within the next 30 to 60 days … we’ll be able to talk in some detail about some of the things we anticipate to happen there in the near future,” said County Administrator Gregory Murray.Demolition of two buildings is under way. The plan also calls for demolishing more than 90 residences, forcing 250 residents to move. The county plans to offer six-month extensions to any tenant whose lease expires after Thursday.PenMar Development Corp. began looking for a buyer for the property in August 2015, two years after regaining control of it from Corporate Office Properties Trust with plans to serve as the post’s master developer. PenMar initially sold it to the developer in 2006.