| 23 Lewin Road Limited | | 1998 |
| 23 Lexham Gardens Limited | East Grinstead | 1998 |
| 23 Livingstone Road Freehold Ltd | New Milton | 2021 |
| 23 Lower Rock Gardens Ltd | Brighton | 2011 |
| 23 Lyme Street London Limited | London | 2011 |
| 23 Lytton Grove Company Limited | London | 2008 |
| 23 Magdalen Road ST Leonards Limited | Eastbourne | 2004 |
| 23 Magdalen Road, ST. Leonards Freeholders Limited | Bromley | 2022 |
| 23 Manor Park RTM Company Limited | London | 2017 |
| 23 Maple Road RTM Company Limited | London | 2014 |
| 23 Maresfield Gardens Limited | Camberley | 2003 |
| 23 Marine Parade Dawlish Limited | Dawlish | 1986 |
| 23 Marjorie Grove Ltd | London | 2006 |
| 23 Marlborough Buildings (Bath) Management Company Limited | Avon | 1983 |
| 23 Marlborough Road Management Company Limited | Surrey | 1995 |
| 23 Mattock Lane Limited | Leatherhead | 2000 |
| 23 Mayflower Road Management Company Limited | London | 2009 |
| 23 Maygrove Road RTM Company Limited | Bexhill-On-Sea | 2023 |
| 23 Meteor Road RTM Company Ltd | Westcliff-On-Sea | 2023 |
| 23 Mildenhall Freehold Limited | London | 2014 |
| 23 Millers Road Brighton Limited | Brighton | 2005 |
| 23 Montpelier Place Management Company Limited | Brighton | 1995 |
| 23 Montrose Avenue (Redland) Management Limited | Bristol | 1982 |
| 23 Moreton Place Limited | London | 1995 |
| 23 Mount Street Limited | London | 2002 |
| 23 Mowbray Road, Cambridge Limited | Cambridge | 2016 |
| 23 Neville Street Management Ltd | Norwich | 2007 |
| 23 New Road RTM Company Ltd | London | 2025 |
| 23 Nicholson Place Limited | Rottingdean | 2026 |
| 23 Norbury Crescent Limited | London | 2009 |
| 23 North Road Management Limited | Peterborough | 2007 |
| 23 Norton Road Management Limited | Hove | 1994 |
| 23 Nottingham Street RTE Company Limited | London | 2013 |
| 23 Oaklands Grove (Freehold) Limited | London | 2013 |
| 23 Ongar Road Limited | London | 1998 |
| 23 Osborne Road Limited | Newcastle Upon Tyne | 2007 |
| 23 Oswin Street Limited | Beckenham | 2015 |
| 23 Palmeira Avenue Mansions RTM Company Limited | Hove | 2009 |
| 23 Palmeira Square (Hove) RTM Company Limited | St. Leonards-On-Sea | 2010 |
| 23 Park Road (Swanage) Management Company Limited | Swanage | 2001 |
| 23 Pembridge Crescent Limited | London | 1991 |
| 23 Pevensey Road Ltd. | East Sussex | 1998 |
| 23 PGT Limited | London | 1986 |
| 23 Priory Park Road Limited | | 2004 |
| 23 Property Management Limited | Penarth | 2024 |
| 23 Putney Hill Management Company Limited | Welwyn Garden City | 2002 |
| 23 QR Twickenham Freehold Limited | Twickenham | 2019 |
| 23 Quarry Road (Hastings) Limited | Hastings | 2021 |
| 23 Queen's Gate (2000) Limited | London | 1999 |
| 23 Queen's Gate Terrace Limited | London | 2011 |
| 23 Queens Gate Gardens Limited | | 1980 |
| 23 Queens Road Ltd | Leytonstone | 2019 |
| 23 Quinton Street Residents Limited | | 1999 |
| 23 Ramsden Road Management Company Ltd | | 1998 |
| 23 Ranelagh Road Management Limited | Weymouth | 1991 |
| 23 Ravenhill Management Company Limited | London | 2006 |
| 23 Redcliffe Street Management Company Limited | London | 2001 |
| 23 Ringcroft Street Limited | | 2003 |
| 23 Rockley Road Limited | Bridgnorth | 1998 |
| 23 Rosary Gardens Freehold Limited | London | 2009 |
| 23 Rothsay Management Ltd | Bedford | 2018 |
| 23 Rousden Street NW1 Limited | London | 1999 |
| 23 Royal Crescent Residents Company Limited | London | 2002 |
| 23 Royal York Crescent Management Company Limited | Bristol | 1972 |
| 23 Sackville Gardens Limited | Hove | 2004 |
| 23 Sandford Road Management Limited | Bromley | 2013 |
| 23 Sears Street Limited | London | 2015 |
| 23 Seaton Avenue Amenity Limited | Plymouth | 2007 |
| 23 Second Avenue Hove Limited | Hove | 2000 |
| 23 Severn Road Management Company Ltd | Warwick | 2021 |
| 23 Sherriff Road Management Co Limited | St. Leonards-On-Sea | 1986 |
| 23 Sherwell Road (Brislington) Management Company Limited | Thornbury | 2011 |
| 23 Sinclair Road Management Limited | Chichester | 1998 |
| 23 Sisters Avenue Ltd | London | 2016 |
| 23 Southsea RTM Company Limited | Leigh-On-Sea | 2023 |
| 23 Spa Hill Limited | London | 2023 |
| 23 Spencer Road Limited | | 1995 |
| 23 Spencer Road Management Limited | Bournemouth | 2024 |
| 23 Springfield Road Freehold Limited | Croydon | 2007 |
| 23 ST James's Square Management Limited | London | 2007 |
| 23 ST Margarets Road Limited | Ruislip | 2007 |
| 23 ST Stephens Avenue Residents Association Limited | Cranleigh | 2003 |
| 23 ST. George's Street Limited | Cheltenham | 1991 |
| 23 ST. Georges Square Freehold Limited | Bristol | 2003 |
| 23 ST. Johns Road (Bristol) Management Limited | Bristol | 1978 |
| 23 ST. Michael's Mount Management Company Limited | Leicester | 2000 |
| 23 ST. Michael's Road Residents Association Limited | | 1990 |
| 23 ST. Philips Road Management Company Limited | Surbiton | 2005 |
| 23 Stanley Street Management Company Limited | Southport | 2004 |
| 23 Stanley Terrace Management Company Limited | Bristol | 2019 |
| 23 Stanwick Road Property Management Company Limited | London | 2005 |
| 23 Station Road RTM Company Limited | London | 2018 |
| 23 Stavordale Road Limited | Dorchester | 2004 |
| 23 Stile Hall Gardens Property Management Limited | London | 2024 |
| 23 Stockleigh Road Ltd | St Leonards On Sea | 2023 |
| 23 Stourcliffe Avenue Freehold Limited | Bournemouth | 2014 |
| 23 Sumatra Road Limited | Sandhurst | 2006 |
| 23 Sussex Square Limited | Brighton | 1994 |
| 23 Sutherland Street (Management Company) Limited | Southampton | 2004 |
| 23 Tanza Road Limited | London | 2016 |