If you possess a copy of the architect's model, then their Title Block Family is almost certainly loaded into it. In order to extract it, open their model¹ (Detach from Central recommended, if applicable) and either a.) locate their Title Block Family in the Project Browser (under Families » Annotation Symbols), right click on the Family Name, and click "Edit" or b.) open one of their Sheet Views, right-click their Title Block, and select "Edit Family". Once the Title Block Family is open in the Family Editor, you can load it into your Project².
¹If you have your model open and the architectural model linked in, you will have to close out of your model first.
²The architect may have included one or more Shared Parameters which will not work properly unless you have loaded these into your Project as Project Parameters that apply to the "Sheets" Category. You can export these Shared Parameters into your Shared Parameters file through the Title Block Family: select a Label that contains a Shared Parameter, click "Edit..." next to 'Label' under Properties, and in the following dialog, select a Shared Parameter from the list on the left, and then click "Edit Family Parameter" below it, and then click "Export..." in the following dialog.
If you run into any issues, don't hesitate to post!
Corey D. ──────────────────────────────────────────────────────────────────────⁞|⁞ Please use .Accept as Solution and Give Kudos as appropriate to further enhance these forums. Thank you!