No. Lexadon own Clifton. Antic have the Dog Star.
435-437 Coldharbour Lane looks like a mixture of both:
The planning history shows plans for a bar on ground floor and basement from A Thomas (Antic) being approved: 10/02057/FUL (Application Permitted)
On the other hand A Thomas' application for flats above was refused a couple of months later: 10/02846/DET Received: Tue 17 Aug 2010 Status: Application Refused
HOWEVER there are currently plans in from Lexadon for this site 12/02837 FUL Received: Fri 27 Jul 2012 Status: Pending Decision.
Lexadon's plans are broadly to demolish the upper stories and create a frontage matching in with Clifton Mansions - in so far as this is possible in vernacular "Viaduct"/Brixton Square style - with 9 flats on 1st/2nd/3rd floors - the new facade matching Clifton Mansions height-wise.
Lexadon say "this application is cognisant of, but not directly linked to 10/02057/FUL (Antic's bar proposals). Lexadon do not say whether they favour a bar or not.
The Lexadon application was advertised a couple of weeks ago in the "Weekender"
(As well as Clifton Mansions, Lexadon also own the Angel ex-Pub and "The Viaduct" - to name just their Coldharbour Lane properties).
You don't have to own a property to apply for planning permission. This proposal could be a combined Antic/Lexadon proposition. Lexadon obviously have the resources to do the development whether jointly or on their own.
Final point - I would have thought it might be difficult to challenge this proposal on Conservation area grounds - Lexadon have done their usual thorough job with a 30 page design statement which alludes to 435-437 Coldhabrour Lane being an ‘Enhancement Opportunity’ and then listing all the surrounding applications going back years. Objecting to losing the 1930s existing building (allegedly in poor state of repair) would seem unlikely to resonate with Lambeth Planners when the Satay Bar and flats above in bland modern style were approved 15+ years ago and a hotel on top of the Woolworths building was approved in July (no sign of building starting yet though!)