The following was extracted from his biography at www.allmovie.com, another movie site to which I often refer.
"In the late 1960s, McCrea increased his wealth by selling 1200 acres of his Moorpark (California) ranch to an oil company, on the proviso that no drilling would take place within sight of the actor's home. By the time he retired in the early 1970s, McCrea could take pride in having earned an enduring reputation not only as one of Hollywood's shrewdest businessmen, but as one of the few honest-to-goodness gentlemen in the motion picture industry."
I especially liked the parts about him dictating terms to an oil company and the very last clause "honest-to-goodness gentlemen" (because there are so few of 'em in Hollyweird.)