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Mosman sits on the lower north shore, and at the Spit end of the suburb the water does most of the work. Birthdays booked here are usually after a harbour outlook and a room big enough to dance in. The venue currently listed in Mosman is the Function Room @ The Boathouse at the Spit, a waterfront function room at the Middle Harbour 16ft Skiff Club on Spit Road, run by Zest Waterfront Venues. It takes up to 450 guests cocktail style or 300 seated with a dancefloor, starts from $195 per person, and rates 4.8 on Google across 422 reviews. Operable walls divide the room, so a party of 60 does not rattle around in a space built for hundreds.
A few things are worth settling before you commit:
The fit-out is warm timber, imported stone and gold-leaf ceilings, which does a fair amount of the decorating for you. A room like that needs less dressing than a bare hall, so put the effort into the running order instead. Ask about access time for setup, where a cake and gifts can go, and how the layout changes if your numbers move in the last fortnight.

Not necessarily. The Function Room @ The Boathouse at the Spit has operable walls that divide the room, so a smaller party can be closed into a proportionate space. Ask which configuration applies at your number and where the bar and dancefloor end up.
The Boathouse at the Spit holds an alcohol licence to 2am, with extensions available. Agree the finish time when you book rather than on the night, and plan transport to match, because there is no train station in Mosman.
By bus along Military Road and Spit Road, by ferry to Mosman Bay or Taronga Zoo wharves, or by car and rideshare. Parking around Spit Road is tight on weekends and over summer, so ask guests to allow extra time or share a ride.
The Function Room starts from $195 per person, so the guest list drives the budget more than anything else. Check what is covered at that rate and what is charged separately before you lock in final numbers.