I am going to start with Gateway House (see the attached image below). According to Pevsner it is one of the finest 1960's office buildings in Manchester. The building was also subject to a 2010 competition to refurbish the area. The architect was Richard Seifert (of the Natwest Tower and Central Point in London fame). This is a concrete frame building with flush glazed curtain walling, horizontally banded in aluminium (?) cladding panels at each floor level. The floating office floors over the ground & first floor shops helps to mediate the large level difference between the station and Ducie Street, a clever solution to the problem. The strength (in my opinion) lies within the sensuous 'lazy-s' form which is very sculptural.
In summary I would give the building a strong

PS I also looked up the practice of Richard Seifert. He retired in 1990s with the practice being continued as John Seifert as 'Seifert Architects International'. They were forced to close in 2010 by a wind up order by HM Revenue and Customs. It is sad to see great firms reduced to bankruptcy but I guess that is the capitalist machine at work, only the behamouths survive.
PPS It looks like Hodder won the competition. Hodder + Partners website