Having been awarded a contract to develop the site, the various firms that comprise the Leggat team have been spending good money on designs, studies, investigations etc. So I think they would have recourse to recouping that spending from the state if their developer designation is now cancelled. for something other than a material breach. An example of a material breach could be Leggat's failure to complete design by date x.
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From the RFP, the re-developed property will be subject to a ground lease from the Commonwealth. After the property is re-developed, the Commonwealth intends to lease 350,000 gsf of space for its own use. The RFP also mandates that there be no loss of current on-site parking paces once the property is re-developed. Leggat has an option of providing parking spaces off-site for any spaces that are lost because of the redevelopment. Any off-site spaces must be near the Massachusetts State House.