If this "first floor addition" adds space for more residents at this property then I support it. The alternative to this gradual increase in North Sydney residents is far better than the ugly, inappropriate multistorey apartment develops - such as what is happening in the former "village" of Crows Nest at St Leonards, in Lane Cove, and coming to the Neutral Bay "village".
Given the state government has MANDATED North Sydney Council has to make room for 15,000 more residents, encouragement of small developments, such as this, should be encouraged if they do not adversely impact the neighbours or the nature of the surrounding areas.