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It's more than that. Look at the recent deal with Sri Lanka to resolve the debt owed to China for building a port there:

"...included a plan for a 99-year lease..."

The loss of sovereignty is the most extreme example for of course. Leasing is something in between. Though 99 years is a pretty long time.

"You can't pay, ok how about we'll just take control of this little part of your country for 99 years".

99 years is long, though significantly less than the duration of the Guantanamo lease.