Blank canvas buildable lots this close to downtown Belfast don't come up often, and fewer still are ones where you can't see the road from where you'd put the house.
Just under half an acre off Congress Street, wooded and set back, private in a way that in-town land usually isn't. The distance to the harbor is easy, not a drive. What you do with it will be the interesting part. There's room here for a house designed around how you actually want to live, sited the way you have always dreamed, with the trees left standing where they matter. This lot adjoins the net-zero home next door, so it can be purchased alongside it for permanent breathing room on that side.
Private, wooded, and within exploring distance of the waterfront. That combination is getting harder to find in Belfast every year.