I know very little of the substance and services here, but I'm guessing the architectural design of Cross Street Chapel in Manchester - situated on the ground floor of a modern office block - will probably draw 'Marmite responses' from Unitarians and other Christian-types.
I can already hear the argument that the more ancient Unitarian & Free Christian chapels of the British Isles should be preserved not just for their historic value, but because they were built by our ancestors at considerable cost and have been hallowed by prayer for centuries. There's much truth in this line of thinking.
That said, I like the simplicity and pragmatic nature of Cross Street Chapel. The chapel inside actually looks very 'Quakeresque' being very plain and with a centrally-focused, circular seating plan. And although I don't know whether it's a rented or an owned space, I would imagine the costs for preserving the chapel are less of a burden than more ancient buildings like Ullet Road Church with its beautiful, tens of thousands of pounds worth of, windows. Ultimately a church building is just another block of bricks and mortar - it's the community inside that counts.