I live in Ridglea Hills, and this has been a hot topic on the neighborhood discussion groups. Yes I would rather have seen the church stay, or another church or business move into the existing building, but I know that was not realistic. I do not believe the building and maintenance were sustainable long-term for the current congregation. The building has far too many major issues, and the parking is terrible. RPC is setting up transition committees to oversee the move and construction of a new facility. I will be sad to see the building demolished.
There was an odd post on a neighborhood facebook group about the sale a few months ago - someone chimed in & said that their family had donated the land for the church in the 1940s, and that there was a stipulation that they could not sell it, but had to return it to the family. I've never heard anything more about it, and assumed it was one of those "family legends gone wrong" type of things. I'm sure Grace Presbytery would have discovered that long ago if it were the case.