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On the sign:
בבית הזה בעלית הגג ביום כ"ה בשבט תש"ב נרצח ע"י שליחי השלטון הזר יאיר הוא אברהם שטרן ראשון לוחמי חרות ישראל מבית זה הוריש את צו המלחמה לחרות המולדת
Yair lived in the home of Tova and Moshe Svorai on 8 Mizrachi Street B (now Abraham Stern Street) - this is where Lehi Museum is located today.
The next photo taken on the same day shows the building and the place of the sign on it Click for a larger image
Translation of the text on the sign: In this attic house on February 12, 1942 Murdered by foreign government emissaries Yair He is Abraham Stern Israel’s first fighters From this house bequeathed the war order to the homeland