In the past tense, the second paragraph is usually used to express regret and express what should have been done but not done.
The difference between the two paragraphs is that the first paragraph represents uncertainty.
The second paragraph means that it should have happened, but it didn't happen.
Supplementary landlord question:
As for the usage of the conditional present tense, as said on the first floor.
For example, the sentence "Il y aurait plusieurs victimes" means that there may be many victims.
Indicates uncertainty. As the usual news says: this mudslide may cause many villagers to disappear.
Conditional past tense expresses regret that it should have happened but it didn't.
For example, this sentence: Elle Aurait Fait Plusieurs Victimes, she would have caused many victims (meaning there were actually no victims).
The translation on the second floor is roughly correct. In the first paragraph, the landlord added "may"
In the second paragraph, add "should"
This is the difference in meaning between the two paragraphs.