For 3520, Line 54 I would list three items: cash (combining all accounts), securities (again combining all accounts) and then the residential real property.
There is no reason to go account by account on "like items" such as the cash and cash equivalents or securities but lumping them together by category will make the items easier to identify if later on there are any questions.
While questions about these assets aren't common, when they are asked it can be many months or years down the line when the details sometimes become a bit more difficult to recall.
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