Grade I listed Marlborough House, remodelled by Robert Adam c.1786 provides (probably) the only example in Brighton of "serlian" windows. These consist of a half-round arched section flanked by two rectangular sections and separated by columns or pilasters. They are named after Sebastio Serlio, an architectural author c.1500.
Pevsner, in his Sussex volume, declares Marlborough House to have the finest facade in Brighton.
Chiswick House (below), also remodelled from an earlier house, also includes serlian windows but here as part of a full-on 1720s Palladian design much favoured by its owner Robert Boyle, 3rd Earl of Burlington; he of the Arcade & Royal Academy but no connection to the physicist.