Yes, the section of Hanbury Street which included No. 29 Hanbury St was demolished in the early 1970's, I think. I was lucky enough to see the street in the 1960's before it all changed. I believe a brewery was built on that side of the road after the houses were demolished and the brewery shell is now a car park.
Probably some re numbering of Hanbury St has gone on in the years since. If you want to see Hanbury St and No. 29 as it was in its last years try and track down 'The London that Nobody Knows' a travelogue with James Mason, who briefly visits the back yard murder site. It's a fascinating piece of film