For the stadium to be fit for football, big money needs to be spent - the conversion will cost between £150 million and £200 million.
Of that, West Ham will contribute fifteen million pounds, Newham Council will lend a further £40m, the government has agreed to provide up to £25 million if it's needed, and the rest will also have to be funded by tax payers.
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Stamp duty is to be abolished for first-time buyers on properties up to £300,000, Chancellor Philip Hammond has announced in his Budget.
The money will help pay for mental health and counselling services, regeneration in the west London neighbourhood and a new community space.
The small device was hidden in a grate in the ceiling in the only customer toilet at a Starbucks coffee shop.