I saw this article a couple of days back. It's probably safe to assume most of the tenants were jews.
Some quotes from the article...
Many Jews are missing, according to Yosef Dahan, a Hatzalah representative who was assisting with search and rescue efforts on site. “Some of the names are known to me,” Dahan said. “Many Jews live in the building itself,” he said.
There is, however, a strong Israeli community in that area of the city.
The area, just north of Miami Beach, is known as one of Miami-Dade’s most Jewish neighborhoods.
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