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In page Erfurt:

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After World War II and over the whole GDR period, housing shortages remained a problem even though the government started a big apartment construction programme. Between 1970 and 1990 large Plattenbau settlements with high-rise blocks on the northern (for 50,000 inhabitants) and southeastern (for 40,000 inhabitants) periphery were constructed. After reunification the renovation of old houses in city centre and the Gründerzeit areas was a big issue. The federal government granted substantial subsidies, so that many houses could be restored.[citation needed]