| 3A, Belsize Avenue, London | - | 57 m² | - |
| 3B, Belsize Avenue, London | Leasehold | 63 m² | £113,000 (2002) |
| 9A, Belsize Avenue, London | - | 93 m² | - |
| 23A, Belsize Avenue, London | Leasehold | 111 m² | £930,000 (2012) |
| 23B Belsize Avenue, London | Leasehold | 100 m² | £1,123,296 (2021) |
| 23C Belsize Avenue, London | - | 104 m² | - |
| 23D Belsize Avenue, London | - | 89 m² | - |
| 25A, Belsize Avenue, London | Leasehold | 291 m² | £940,000 (2009) |
| 25B, Belsize Avenue, London | Leasehold | 106 m² | £1,125,000 (2012) |
| 29A Belsize Avenue, London | Leasehold | 123 m² | £1,465,000 (2019) |
| First Floor Flat, 29 Belsize Avenue, London | Leasehold | 109 m² | £1,325,000 (2021) |
| Flat 1, 1 Belsize Avenue, London | Leasehold | 94 m² | £960,000 (2010) |
| Flat 1, 3 Belsize Avenue, London | Leasehold | 70 m² | £1,075,000 (2015) |
| Flat 1, 15, Belsize Avenue, London | - | 53 m² | - |
| Flat 1, 21 Belsize Avenue, London | Leasehold | 275 m² | £3,845,000 (2022) |
| Flat 1, 27 Belsize Avenue, London | - | 241 m² | - |
| Flat 2, 1 Belsize Avenue, London | Leasehold | 81 m² | £870,000 (2013) |
| Flat 2, 5 Belsize Avenue, London | Leasehold | 50 m² | £560,000 (2022) |
| Flat 2, 15, Belsize Avenue, London | - | 55 m² | - |
| Flat 2, 21 Belsize Avenue, London | Leasehold | 94 m² | £360,000 (2000) |
| Flat 2, 31 Belsize Avenue, London | Leasehold | 124 m² | £1,200,000 (2024) |
| Flat 3, 1 Belsize Avenue, London | Leasehold | 75 m² | £970,000 (2015) |
| Flat 3, 3 Belsize Avenue, London | - | 42 m² | - |
| Flat 3, 5 Belsize Avenue, London | Leasehold | 78 m² | £1,135,000 (2025) |
| Flat 3, 7 Belsize Avenue, London | - | 78 m² | - |
| Flat 3, 11 Belsize Avenue, London | - | 206 m² | - |
| Flat 3, 15, Belsize Avenue, London | Leasehold | 54 m² | £265,000 (2009) |
| Flat 3, 21 Belsize Avenue, London | Leasehold | 51 m² | £550,000 (2025) |
| Flat 3, 27 Belsize Avenue, London | Leasehold | 46 m² | £550,000 (2022) |
| Flat 4, 3 Belsize Avenue, London | Leasehold | 49 m² | £278,000 (2003) |
| Flat 4, 5 Belsize Avenue, London | - | 41 m² | - |
| Flat 4, 11 Belsize Avenue, London | Leasehold | 77 m² | £1,085,000 (2024) |
| Flat 4, 15, Belsize Avenue, London | - | 50 m² | - |
| Flat 4, 27 Belsize Avenue, London | Leasehold | 58 m² | £625,000 (2024) |
| Flat 5, 3 Belsize Avenue, London | Leasehold | 34 m² | £129,500 (1999) |
| Flat 5, 5 Belsize Avenue, London | Leasehold | 40 m² | £525,000 (2023) |
| Flat 5, 11 Belsize Avenue, London | - | 42 m² | - |
| Flat 5, 15, Belsize Avenue, London | Leasehold | 42 m² | £460,000 (2014) |
| Flat 5, 21 Belsize Avenue, London | Leasehold | 63 m² | £622,300 (2021) |
| Flat 5, 27 Belsize Avenue, London | - | 45 m² | - |
| Flat 5, 31 Belsize Avenue, London | - | 16 m² | - |
| Flat 6, 5 Belsize Avenue, London | - | 39 m² | - |
| Flat 6, 11 Belsize Avenue, London | - | 141 m² | - |
| Flat 6, 27 Belsize Avenue, London | Leasehold | 53 m² | £111,000 (1997) |
| Flat 6, 31 Belsize Avenue, London | - | 19 m² | - |
| Flat 7, 5 Belsize Avenue, London | - | 44 m² | - |
| Flat 7, 15 Belsize Avenue, London | Leasehold | 57 m² | £230,000 (2004) |
| Flat 7, 27 Belsize Avenue, London | Leasehold | 100 m² | £700,000 (2026) |
| Flat 7, 31 Belsize Avenue, London | - | 19 m² | - |
| Flat 8, 5 Belsize Avenue, London | - | 69 m² | - |
| Flat 8, 15 Belsize Avenue, London | Leasehold | 49 m² | £368,000 (2010) |
| Flat 8, 31 Belsize Avenue, London | - | 19 m² | - |
| Flat 9, 15, Belsize Avenue, London | Leasehold | 62 m² | £567,000 (2016) |
| Flat 9, 31 Belsize Avenue, London | - | 16 m² | - |
| Flat 10, 15 Belsize Avenue, London | - | 68 m² | - |
| Flat 10, 31 Belsize Avenue, London | - | 18 m² | - |
| Flat 11, 15 Belsize Avenue, London | Leasehold | 58 m² | £500,000 (2017) |
| Flat 11, 31 Belsize Avenue, London | - | 13 m² | - |
| Flat 12, 15 Belsize Avenue, London | - | 51 m² | - |
| Flat 12, 31 Belsize Avenue, London | - | 15 m² | - |
| Flat 13, 31 Belsize Avenue, London, London | - | 25 m² | - |
| Flat 14, 15, Belsize Avenue, London | - | 49 m² | - |
| Flat 14, 31 Belsize Avenue, London | - | 20 m² | - |
| Flat 15, 15 Belsize Avenue, London | - | 48 m² | - |
| Flat 15, 31 Belsize Avenue, London | - | 16 m² | - |
| Flat 16, 15, Belsize Avenue, London | Leasehold | 48 m² | £380,000 (2010) |
| Flat 16, 31 Belsize Avenue, London | - | 13 m² | - |
| Flat 17, 15, Belsize Avenue, London | - | 54 m² | - |
| Flat 17, 31 Belsize Avenue, London | - | 15 m² | - |
| Flat 18, 15, Belsize Avenue, London | Leasehold | 56 m² | £400,000 (2007) |
| Flat 18, 31 Belsize Avenue, London | - | 22 m² | - |
| Flat 19, 31 Belsize Avenue, London | - | 37 m² | - |
| Flat 20, 15, Belsize Avenue, London | Leasehold | 61 m² | £590,000 (2015) |
| Flat 23, 15, Belsize Avenue, London | - | 109 m² | - |
| Flat 24, 15 Belsize Avenue, London | Leasehold | 96 m² | £765,000 (2022) |
| Flat 26, 15, Belsize Avenue, London | Leasehold | 94 m² | £780,000 (2025) |
| Flat 28, 15 Belsize Avenue, London | Leasehold | 96 m² | £817,500 (2016) |
| Flat B, 9 Belsize Avenue, London | Leasehold | 70 m² | £885,000 (2024) |
| Flat C, 9 Belsize Avenue, London | Leasehold | 80 m² | £1,020,000 (2016) |
| Flat C, 25 Belsize Avenue, London, London | Leasehold | 105 m² | £1,420,000 (2023) |
| Flat D, 7 Belsize Avenue, London | Leasehold | 73 m² | £928,000 (2019) |
| Flat D, 9 Belsize Avenue, London | - | 79 m² | - |
| Flat D, 25 Belsize Avenue, London | Leasehold | 108 m² | £774,000 (2008) |
| Ground Floor Flat, 31 Belsize Avenue, London | - | 123 m² | - |
| Raised Ground Floor Flat, 7 Belsize Avenue, London | Leasehold | 81 m² | £1,007,500 (2022) |
| Second Floor Flat, 29 Belsize Avenue, London | Leasehold | 62 m² | £420,000 (2009) |
