Lynarstrasse during the war?

Lynarstrasse 18 was part of the Siemensstadt industrial belt, so "Verbundslager GmbH" was almost certainly a Siemens subsidiary or contractor running a Gemeinschaftslager, a communal camp for forced labourers. That fits your Bundesarchiv find about barracks for foreign workers, the two are the same story. Your grandfather's Arbeitsamt records would have come through the Spandau labour office, and those files sometimes survive in the Landesarchiv Berlin rather than the Bundesarchiv.

For the company itself, try the Siemens Corporate Archives (Siemens Historical Institute) in Munich, they hold a lot of Werk Spandau material including camp administration. The Arolsen Archives online are also worth a search on his name and on Lynarstrasse, they have camp lists and often name the firm.

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The street name in your records is probably a transcription slip, it's Lynarstraße with an ß, which matters when you search databases because OCR often renders it as "Lynarstrasse" or drops the umlaut entirely. For Spandau specifically, the Heimatmuseum Spandau has a decent photo archive and vertical files on the industrial streets, and they've helped people trace Zwangsarbeit addresses before. Worth an email to them with the house number, they can tell you what stood at 18 before and after the war, since a lot of that block was rebuilt.

On the Arbeitsamt side, the Berlin Landesarchiv holds Spandau labour office files under Rep. 214, but access requires a written Antrag and patience, usually several weeks. If you can visit in person at Eichborndamm, the reading room staff are genuinely good at pointing you to the right Bestand once you show them the document you already have.

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Verbundslager as a name is worth unpacking because it doesn't show up as a normal company in the Berlin address books, which usually means it was a purpose-built Verwaltung for several camps under one roof rather than a factory. Siemens ran a bunch of these Sammellager around Spandau and Haselhorst, so the g.m.b.h. was probably just the admin shell. Check the 1941 and 1943 Berliner Adressbuch for Lynarstr 18, the entries are online at the Zentral- und Landesbibliothek and they list who was registered there by year. If it flips from a private owner to a firm name between those editions that tells you when the camp went up.

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Worth noting that Berlin street names have official umlaut and ß rules that trip people up, so a sign showing "Strasse" versus "Straße" is not actually a spelling error, just an older transcription. Same with "ue" versus "ü" (e.g. "Kantstrasse" vs "Kantstraße"), both are considered valid renderings and you'll see the ß version on the blue Schilder and the ss version on older plaques or in databases that predate Unicode. If the difference you're seeing is between those two forms, there's nothing to fix and both are technically correct.

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if the signs u mean are the old enamel ones on the house facades those are often protected as Baudenkmal so nobody's allowed to correct them even if the spelling is outdated. the binding version is whatever is in the Berliner Strassenverzeichnis plus the entry in the Liegenschaftskataster, so if u tell me the street i can point u to the right Bezirksamt Mitte or Charlottenburg-Wilmersdorf page. tbh the merged district thing is real but the facade signs are a separate story, theyre basically museum pieces at this point

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honestly thats super common in Charlottenburg, the district offices were merged from older Bezirke and nobody ever fixed all the Schilder. if its a real street you can check the official strassenverzeichnis on berlin.de, that list is what the Burgeramt actually goes by. which street is it? some of the Kaiserdamm / Kantstrasse signs are notorious for this.

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