The three verb tense errors are the verbs "had", "knew", and "was", since they are used in the simple past when the rest of the verbs is used in the present.
When writing a text, we must be consistent in our use of verb tenses. The text that we are analyzing here is about the rights one has when it comes to renting a house or apartment. Since those rights are valid in the present, it is better to use the simple present as the predominant verb tense.
However, there are three moments in the text where the writer sort of slips up and uses the simple past:
Those are the three errors in the text. To correct them, we should use the simple present version of those verbs:
Learn more about verb tenses here:
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