Baillie Lodges reveal ribbed modernist addition to proposed boutique hotel in Victorian-era The Rocks in Sydney

Boutique lodge operator Baillie Lodges has submitted a development application for its proposed new ultra-expensive hotel, including a new "ribbed building" joining two Victorian-era warehouses dating back to the 1840s.

Photos included in the submissions show a Sydney seeped in Victorian-era architecture with brick terraces and horse-drawn carts.

The application by Baillie Lodges has an estimated construction cost of $6.3 million.

It features a new two-storey building to be built on the site of the Westpac museum with a ribbed façade and a roof terrace, linked to 47 George Street.

Baillie Lodges – run by husband-and-wife operators James and Hayley Baillie – is targeting a mid-2014 opening for what would be its first inner-city Sydney venture.

They are seeking to make alterations and additions to two existing heritage listed buildings, demolish the 1980s-built former Westpac Museum and erect a new building to create the new boutique hotel.

The heritage buildings stand on the corner of George Street and Atherton streets in the Rocks and form part of a predominantly Victorian and Edwardian streetscape at the northern end of George Street.

The two heritage buildings are Union Bond Store at 47 George Street, Merchants House at 43-45 George Street as well as the adjoining Avery Terrace site, which houses the former Westpac Museum.