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Get a Notice | California Courts | Self Help Guide
3-day Notice to Perform Covenants or Quit means you must do something, like remove a pet from the house if the lease says "no pets," or move out within 3 days.
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https://law.lclark.edu/live/files/25490-property
The law implies a covenant between the landlord and tenant in which the landlord agrees to respect the tenant's right to quiet enjoyment.
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Loan covenant - Wikipedia
A loan covenant is a condition in a commercial loan or bond issue that requires the borrower ... Covenants may also be waived, either temporarily or permanently, ...
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