Received another email from plant owner. (Possibly because I mentioned I might just put plant in paper bag and set it on fire!). He writes:
I finally found it!
Chlorophytum saundersiae
Chlorophytum saundersiae
Chlorophytum saundersiae is a popular garden plant and is used extensively by landscape gardeners. It has a pleasing grass-like appearance making it a good filler'...
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I think this is it!