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Goerzallee 311, next to the rails of Märkische Kleinbahn, appears to have a roof shared by Telekom (4G and maybe 2G) and Vodafone (2G/3G/4G) sites.
View of the most antennas, including the Telekom mast, from the south on the opposite street side.
... here seen from the east on the same street side.
Distant view from the north-east at Goerzallee:
Distant view from south-west at Beeskowdamm: