Hi Ben,
I think those 64 addresses are the local residents to whom the original notification of planning permission was sent to.
As you can see, several of them are in adjacent roads such as Gaynesford Rd or Whitney Path off Mayow Road, which have no view of the property, (so I assume they are within a certain geographical area which is required to be notified) so those people are less likely to have objected.
Also 12 of those addresses are in the 125-129 Sunderland Road property, which I believe is a "half-way-house" for "care in the community" or something similar, so again it's less likely that they have objected.
Also, a number of them are in Aylward Rd where I believe a number of the properties are owned by the family of the proposed development at 139 Sunderland Road, so once again they are unlikely to have objected.
There have been 12 objections on the Lewisham website for over a week now, so I hope that will increase to 13 given that the FHS have now objected too.
I'm don't think you can see the details of each objection on the Lewisham website (although the FHS have posted theirs on their website). If you PM me, I can probably give you some more detail.
Rob.