This now sounds like Vale Lodge, a private block of flats on the northern corner of Perry Vale and Dacres Road junction. It was built around 1936. I used to live there- I dont know if I have a copy of the lease any more but I would hedge a bet thats your site however it was built pre war so doesnt fit your demolition thesis. On the other side is Valentine Court which I think was built inter war. So if its not Vale Lodge I don't know what it could be as Perystreete is also interwar. Interesting stuff all this!