The Sod:
hydroseeding for a turf lawn (not erosion control) $0.10/sq ft
sod should run $3.75-$4.00/yard installed (fescue and $1.75/yard cost)
Assume the Mall is approximately 500 yds wide.
(1.7M sq. yrds) X $4.00/sq yd = $6.8M worst case