You're wrong on two counts: First, the Property Clause, which Tipaw quoted in full, has absolutely nothing to do with ports, forts, or ten miles square (not square miles, btw - there is a difference, but since you can't read for comprehension, I won't bother explaining math concepts to you). Second, at no point does the Property Clause or Article 1, Section 8 prohibit the government from owning land. If you can find the spot where it says, "the government can own no land except this one little bit" please feel free to enlighten the countless Constitutional scholars and Supreme Court (and lesser) judges who disagree with you.