I've been wondering about that this week. What about using the Subject 
Term, type Geographic Name (651) and then putting your Ordance Survey 
grid references as the geoname source.

Below is something I am pondering doing. I would rather have an 
organizational thesaurus for this hotel location, even a geo coordinate 
type of thing but I am unaware of any free thesauruses to use.

<controlaccess>
     <geogname source="local">San Francisco 
(Calif.)--Buildings--International Hotel</geogname>
</controlaccess>

Jane Stevenson wrote:
> Hi all,
>
> Has anyone ever thought about adding grid references to their EAD 
> desscriptions? In the UK we have the Ordance Survey grid references 
> for places 
> (http://en.wikipedia.org/wiki/British_national_grid_reference_system), 
> and we have a contributor to the Hub who would like to include these. 
> However, EAD certainly does not seem to have a way to incorporate them 
> into the <geogname>.
>
> I assume there is an equivalent in the States, but I don't know for sure.
>
> Any ideas very welcome.
>
> thanks
> Jane.
>
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> Jane Stevenson
>
> Archives Hub Co-ordinator
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