Chicago manual of style block quote reference placement
According to the style manual itself, the preferred placement is generally after the quotation. However, it allows for placing it before the citation as well.
From CMOS 16th ed., section 15.25:

Text citations in relation to direct quotations. Although citation of a source normally follows a direct quotation, it may precede the quotation - especially if such a placement allows the date to appear with the author's name.
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When the source of a block quotation is given in parentheses at the end of the quotation, the opening parenthesis appears after the final punctuation mark of the quoted material. No period either precedes or follows the closing parenthesis.

This doesn't directly address the case when the author's name is already present in the preceding sentence. However, if we instead look at Kate L. Turabian's Manual for Writers, 8th ed., we're given an example in line with your second example. A similar example is shown in these notes.
All in all, I think your second way is generally preferred. Nevertheless, there is some freedom you can use if it makes things clearer. For example, if the parenthetical citation does not include the year (which seems not be required for block citations) putting the citation (including year) before the quotation may be a good idea.