The full business plan for the bridge was published by London mayor Sadiq Khan, as promised yesterday (18 March).
Speaking to LBC radio Khan gave his support to the bridge on the proviso that several demands were met, including a reduction in the number of days and hours the bridge is closed for fundraising events, and ensuring more local children get involved in the planting and maintenance of the bridge.
Today he published the full TfL business case for the Garden Bridge, which includes details of funds raised so far.
Although many donors are listed as anonymous (PDF), the documents show almost £39m has come from trusts and foundations, £33m from companies and £11m from individual donors.
The Garden Bridge Trust anticipates 5 per cent of visitors would be willing to donate through a contactless payment system "as an acknowledgement of this new free garden". It expects to raise around £700,000 in the first year through this system, and £525,000 in the following years.
It also plans to allow private hire of the bridge six times per year, with a hire fee of £60,000. An endowment fund, donor galas, merchandise and the creation of a Friends of the Garden Bridge group in America would also contribute to the costs.