I don't remember the stables but did think I had seen horses and riders on the trails in the park. Coming up from Brazoria Co. on 288, it turned into Almeda but we always went west on Holcombe to get to Main or West U.
As a member, it is disappointing but frankly not too surprising. As sudden as it was, with many members being left with months of prepaid membership, which have not yet been returned, it appears to be a financial crisis. I do know, that the owner was very upset by the plans to route Commerce Street under the tracks, which appears as though it may cut-off/isolate the property. But, that is not the reason for the closure.