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When the baal aliyah (tenant) builds on the baal habayis's (owner's) property without permission, who owns the house and why is rental payment required? The shiur analyzes the difficult sugya of zenana vezelo chasar, arguing that the baal aliyah's ownership is limited to a monetary claim—he cannot use the property, only demand payment. This reframes the rental obligation: the tenant is using what belongs (in some sense) to the owner, even though legal title hasn't transferred.
This shiur explores a complex sugya in Baba Kamma 20b concerning the case of yoreid she'lo bereshus (one who goes down onto another's property without permission) and the resulting questions of ownership and rental obligations. The central tension is: who owns the house the baal aliyah built, and why is there an obligation to pay rent (zenana vezelo chasar chayav)? Rabbi Zweig begins by distinguishing between increasing an asset's value versus providing actual tangible benefit. If someone builds three walls around a field, the property's market value increases, but the owner hasn't received any usable hana'ah—only a ledger entry. This is called "lo ne'ena" (not benefited). However, if a fourth wall completes the enclosure, the owner now has a qualitatively better life—privacy, security from animals, a shomer dika property. That is real hana'ah, not just increased asset value. The Gemara (גמרא)'s baseline is that you only pay for tangible hana'ah or actual use, not merely for enhanced property valuation.
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Bava Kamma 20b
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