Alte Post Neukölln, Former post office in Neukölln, Berlin.

Alte Post Neukölln is a Renaissance-style building standing at an angle on Karl-Marx-Straße, featuring a symmetrical stone facade with detailed architectural elements. Today it serves as offices, shops, restaurants, and residential apartments.

The building was constructed in 1906 as the Imperial Post Office and received a telephone exchange extension between 1923 and 1926 designed by Arnold Kayser. These additions reflect how communication technology evolved in the city.

The building's name, Alte Post, recalls its role as Rixdorf's Imperial Post Office No. 1, inaugurated in 1906. Its Renaissance-derived forms are mixed with quotations from other eras, and before World War II an entrance pavilion with a baroque onion dome and a roof turret further marked the main front. From summer 2008 the vacant building hosted exhibitions, theatre and school workshops under the district office's "Aktion! Karl-Marx-Straße" initiative.

The building is located on Karl-Marx-Straße and easy to spot due to its distinctive corner location and architectural style. Visitors can explore the various public areas, shops, and restaurants throughout the day.

The telephone exchange added by Arnold Kayser between 1923 and 1926 is being raised by two storeys to create maisonette flats, part of a Coros scheme of over 17,000 square metres of offices, shops, restaurants and housing. The main building's pre-war entrance pavilion with a baroque onion dome and a roof turret are gone.