Yes the sign at the top says:
19 HRVATSKI DOM 25
SV. NIKOLA ODSJ. BR. 304 N.H.Z.
• Hrvatski dom = Croatian House.
• Sv. Nikola = Sveti Nikola = St. Nicholas
• odsj. br. 304 = [I think] odsjeka broj 304 = chapter/section/lodge number 304
• N.H.Z. = Narodna hrvatska zajednica = N.C.S./National Croatian Society
The Narodna hrvatska zajednica (National Croatian Society) was known by that name from 1897 to 1926, when it merged with three other organizations to become the Hrvatska bratska zajednica (Croatian Fraternal Union).
Sv. Nikola lodge 304 apparently continues to exist and meets at a restaurant in Pittsburgh now.
What a bunch of white paint.
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In downtown Ambridge, Pennsylvania, on July 10th, 2020, on the east side of Merchant Street south of 4th Street, a "contributing property" in the Ambridge Commercial Historic District, 100005420 on the National Register of Historic Places.
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Getty Thesaurus of Geographic Names terms:
• Ambridge (7013292)
• Beaver (county) (1002171)
Art & Architecture Thesaurus terms:
• awnings (300254200)
• brick (clay material) (300010463)
• fraternal lodges (300007071)
• gray (color) (300130811)
• historic buildings (300008063)
• historic districts (300000737)
• law offices (300444926)
• metal (300010900)
• paint (coating) (300015029)
• remodeling (300135427)
• repurposing (300417716)
• telephone numbers (300435688)
• white (color) (300129784)
Wikidata items:
• 10 July 2020 (Q57396811)
• 1920s in architecture (Q11185486)
• 1925 in architecture (Q2811396)
• Alsko (Q112996260)
• Ambridge Commercial Historic District (Q112945203)
• Area code 724 (Q3150268)
• contributing property (Q76321820)
• Croatian diaspora (Q1253297)
• Croatian Fraternal Union (Q3504962)
• July 10 (Q2689)
• July 2020 (Q55281154)
• National Register of Historic Places (Q3719)
• Pittsburgh metropolitan area (Q7199458)
• Saint Nicholas (Q44269)
• Taylor (Q15080511)
• Treaty of Fort Stanwix (1784) (Q3536790)
• Western Pennsylvania (Q7988152)
Library of Congress Subject Headings:
• Buildings—Pennsylvania (sh85017803)
• Historic districts—Pennsylvania (sh91004519)