A classic UFO seen in central Melbourne, hovering at biulding level the windows and other features were visable.2 people were riding in a cab down Punt st and crossing Commercial st, my girlfriend spotted the object first (her initial thought was 'its a space ship') and then tapped me on the shoulder asking 'Whats that'. I looked down Commercial st towards Albert Park to see an object floating in the air level with the top of the nearest biulding to us in the st. It was very close to us, approx 20 metres up and 20 metres away and looked very big!! We saw a disc shaped craft (classic looking UFO) with a lot of glass looking windows on the top of the craft with lots of white light inside. The bottom of the object was tilted towards us and I could see the flat disc shaped bottom of the object. There were several half spheres prodruding from the base with lights shining from the edges of the spheres.It was at that point I thought 'Its a UFO!!' It reminded me very much of many pictures I have seen on TV and magazines.The object was quickly lost from our sight when a biulding obscured it as the taxi driver had not seen the object and had continued driving. I made the driver go round the block and then drive around the area for 20 minutes. We never saw anything further.The next day I scoured the papers, news on the tv and internet for other reportings, I never saw any other mention of this object. This did seem strange to both me and my girlfriend as the object was very big and in the middle of Melbourne??? We went back the following night and nothing looked similar to what we saw. I also walked down the street one day and there is a helicopter landing pad further down the st for a hospital. I called them up and asked if they had spotted anything with there radar, etc. They had had nothing reported.To this day we do not know what we saw, though it certainly was not a helicopter, reflected lights, etc.