May a tenant sublet or assign the lease without the landlord's permission under Law 136 of 1981?

No, not as a general rule. For a lease governed by Law 136 of 1981, the landlord may seek eviction if it is proved that the tenant assigned the premises or sublet them without the landlord’s express written permission, subject to the statutory exceptions referenced in the provision. 1

The relevant provision does not establish a general right to sublet or assign without permission. It preserves cases in which the law permits subletting or assignment under Article 29 of Law 49 of 1977. 1 The library materials provided do not include that Article, so the scope of those exceptions cannot be determined here.

For certain permitted sales or assignments, the landlord is entitled to 50% of the sale price or assignment consideration, after deducting the value of movables in the premises; the tenant must notify the landlord through a process- server before concluding the agreement. 5

Library limits: the text of Article 29 of Law 49 of 1977 is not included.