First, you can read the opinion.
http://caselaw.lp.findlaw.com/scripts/getcase.pl?court=US&vol=000&invol=04-108&friend=nytimesBut as to the requirments for eminent domain, aside from compensation, there is the following:
*As for the first proposition, the City would no doubt be forbidden from taking petitioners' land for the purpose of conferring a private benefit on a particular private party. See Midkiff, 467 U. S., at 245 ("A purely private taking could not withstand the scrutiny of the public use requirement; it would serve no legitimate purpose of government and would thus be void"); Missouri Pacific R. Co. v. Nebraska, 164 U. S. 403 (1896).5 Nor would the City be allowed to take property under the mere pretext of a public purpose, when its actual purpose was to bestow a private benefit. The takings before us, however, would be executed pursuant to a "carefully considered" development plan. 268 Conn., at 54, 843 A. 2d, at 536. The trial judge and all the members of the Supreme Court of Connecticut agreed that there was no evidence of an illegitimate purpose in this case.6 Therefore, as was true of the statute challenged in Midkiff, 467 U. S., at 245, the City's development plan was not adopted "to benefit a particular class of identifiable individuals."*