Found Delvinside on the 1928/1929 Valuation Roll.
The address is Lockerbie Road.
It is a tad confusing. The Valuation Roll gives the house in Lockerbie Road and the Street Directory as Greenbrae.
The only thing I think it might be The houses at the top of Lockerbie Road, were Greenbrae, which is opposite Greenbrae Loaning.
I know a chap who was a postman, he may be able to shed some light on it.