Corporate participation involves an annual unrestricted gift of $2,500 or more for Chancellor's Circle or of $1,000 or more for Chancellors Associates.
( ( Corporate participation ) ( ( ( involves ( ( an ( annual ( unrestricted gift ) ) ) ( of ( ( ( $ 2,500 ) or ) more ) ) ) ) ( ( ( for ( ( Chancellor 's ) Circle ) ) or ) ( of ( ( ( ( $ 1,000 ) or ) more ) ( for ( Chancellors Associates ) ) ) ) ) ) . ) )
(ROOT (S (NP (JJ Corporate) (NN participation)) (VP (VBZ involves) (NP (NP (DT an) (JJ annual) (JJ unrestricted) (NN gift)) (PP (IN of) (NP (QP ($ $) (CD 2,500) (CC or) (JJR more))))) (PP (PP (IN for) (NP (NP (NNP Chancellor) (POS 's)) (NNP Circle))) (CC or) (PP (IN of) (NP (NP (QP ($ $) (CD 1,000) (CC or) (JJR more))) (PP (IN for) (NP (NNP Chancellors) (NNPS Associates))))))) (. .)))
There is only one annual giving option for corporate participation. 
( There ( ( is ( ( ( only one ) annual ) ( giving ( option ( for ( corporate participation ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBZ is) (NP (NP (QP (RB only) (CD one)) (JJ annual)) (VP (VBG giving) (NP (NP (NN option)) (PP (IN for) (NP (JJ corporate) (NN participation))))))) (. .)))