A SIX-bedroom regency mansion in one of Brighton’s most exclusive seafront squares is set to become the city’s most expensive house.

If 26 Lewes Crescent sells for anywhere near its £4.25 million asking price, it will stomp into the lead in a list of the city’s most valuable properties.

The Grade I-listed, five-storey mansion has been renovated to bring the Georgian masterpiece into the 21st century, with iPad-controlled lighting, steam room, glistening granite, built-in coffee machines and electronically operated rain-sensitive windows.

The city’s previous most expensive house was 44 Tongdean Avenue, which sold in June last year for £3.4 million.

The prestigious square has a private garden and tunnel to the beach, which inspired Alice In Wonderland’s rabbit hole after author Lewis Carroll visited 11 Lewes Crescent.

Lewes Crescent formed part of Thomas Reed Kemp’s vision for Brighton and Hove and, together with Arundel Terrace, Chichester Terrace and Sussex Square, is believed to be the finest example of Regency architecture in the UK.

The house itself was designed by Charles Busby and Amon Henry Wilds in the 1820s and built by Thomas Cubitt. It is one of his few complete Regency mansions left in the city.

King Edward VII’s daughter, Princess Louise, once lived in Lewes Crescent and actress Cate Blanchett bought a house there in the noughties.

Other famous residents have been Vita Sackville-West and Laurence Olivier. Estate agents Brand Vaughan, which is marketing the property, described it as “without doubt, one of Brighton’s premier residencies”.