Sofia: a mountain in every window.

On clear winter mornings the city checks the summit the way other cities check the weather. Somewhere above the rooftops the snow line has moved overnight, and two million people notice before their first coffee. This is the quiet, improbable fact of Sofia: a capital of boulevards, opera and ministries that keeps a 2,290-metre mountain at the end of the street. Not on the horizon. At the end of the street.

The geography of the south

In most cities, "south-facing" is a promise about light. In Sofia it is a promise about both light and landscape, because the mountain and the sun share an address. The streets that hold the view run through the upper reaches of Lozenets and Iztok, and higher still through Boyana and Dragalevtsi, where the city gathers at the mountain's collar. An apartment that faces south here faces the theatre - and the theatre changes daily: green in June, gold in October, white from the first November snow.

The view, however, is not evenly distributed. It belongs to particular floors on particular streets, to sightlines that clear the neighbouring roofline by a metre or miss it entirely. Two identical plans in the same building can look at two different cities.

What a sightline is worth

Views are the least regulated luxury in real estate: nothing in a title deed protects one. Which is why, in our own work, the mountain enters the file before the floor plan does - through zoning maps and permitted heights, through the simple question no brochure answers: what may one day stand between this window and the mountain? A protected sightline in a mountain-facing street commands a premium that compounds quietly, because the supply of such windows is finite and the city keeps building. An unprotected one is a view on loan.

This is the discipline the postcard hides. The mountain is free; the window that holds it is not. Reading the difference - street by street, floor by floor - is where an address becomes an asset.