Offices, shops and restaurants at More London - including City Hall - were shut on Monday after flood water from a burst main in Tooley Street engulfed the estate's underground service area causing a power cut.
Customers at M&S Simply Food were warned of stock shortages with a delivery expected at midday.
Three large hoses disappeared down Braidwood Street into More London's underground servicing area which was worst hit by the flooding.
Another hose stretched from the construction site for PricewaterhouseCoopers' new building across More London Riverside and into the Thames.
Transport for London says that Tooley Street could remain shut to traffic until Saturday 3 May whilst the clear-up operation continues.
The problems at More London could have a knock-on effect for the declaration of the results of this week's London election due to be held on Friday evening at City Hall.
London Elects, the body which organises the elections, says that a decision on the location for the declaration of the result will be made by Tuesday.