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On the sign:
סמל העיר תל אביב עיריית תל אביב יפו
כאן שכן בית ספר "קלישר", ששימש בשנים תש"ב-תש"ח (1948-1942) את ההגנה, צבא המדינה שבדרך, כבסיס אימונים בנשק קל, שדאות, טופוגרפיה, עזרה ראשונה, קשר, הגנה עצמית ועוד. במקום היה מחבוא לנשק (סליק).
סמל העיר תל אביב סמל ההגנה
Between 1942 and 1948, the Kalischer School, formerly located here, was used by the Hagana - Israels pre-State army - as a base for training in light weapons, fieldcraft, topography, first aid, signal communications, and self-defense. It also housed a secret arms cache.
The sign is rectangular but its head is designed according to the emblem of the city of Tel Aviv
See the sign in full and the building in front of it is placed in the next photo taken on the same day by the same photographer Click for a larger image
Translation of the text on the sign: The emblem of the city of Tel Aviv Tel Aviv Jaffa municipality
The emblem of the city of Tel Aviv The emblem of the Haganah organization
The rest of the Hebrew text is translated to English on the sign