A closer look at the exterior facade of the penthouse, which is clad in <span style="font-family: Theinhardt, -apple-system, BlinkMacSystemFont, &quot;Segoe UI&quot;, Roboto, Oxygen-Sans, Ubuntu, Cantarell, &quot;Helvetica Neue&quot;, sans-serif;">glass reinforced concrete (GRC) that was matched to the existing concrete.</span>  Photo 10 of 11 in A Penthouse Apartment in a London Water Tank Offers Utilitarian Style for $781K

A Penthouse Apartment in a London Water Tank Offers Utilitarian Style for $781K

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A closer look at the facade of the penthouse and the fixed louvres. The exterior is clad in glass-reinforced concrete (GRC) that, per the historic society, had to be matched to other sections of the existing concrete structure.