Mankato, Minn., Code of Ordinances ch. 7 § 7-57

Not more than 25 percent (rounded up) of the lots on any block shall be eligible to obtain a rental license or to be licensed as a rental property. (1)
When determining the number of eligible lots on a block for rental license purposes, the number shall be the lowest number that results in 25 percent of the residential lots being rental. The following table indicates how many lots are able to be licensed as a rental property based on the number of lots that exist in a block:
Lots | Rental | Lots | Rental | Lots | Rental | Lots | Rental | Lots | Rental
1--4 | 1 | 25--28 | 7 | 49--52 | 13 | 73--76 | 19 | 97--100 | 25
5--8 | 2 | 29--32 | 8 | 53--56 | 14 | 77--80 | 20
9--12 | 3 | 33--36 | 9 | 57--60 | 15 | 81--84 | 21
13--16 | 4 | 37--40 | 10 | 61--64 | 16 | 85--88 | 22
17--20 | 5 | 41--44 | 11 | 65--68 | 17 | 89--92 | 23
21--24 | 6 | 45--48 | 12 | 69--72 | 18 | 93--96 | 24
In cases in which one portion of the block is not subject to the application of this section, only the affected portion of the block is subject to this regulation.
(2) The following shall apply to the determination of eligible lots:
a. For the purposes of this subsection, the term "block" means an area of land enclosed within the perimeter of streets, watercourses, railroad right-of-way; public parks, municipally owned lands, and city boundaries, unless otherwise depicted on the map attached to the ordinance from which this section is derived. The map depicts the boundary of blocks for the purpose of establishing the number of lots in a block.
b. This subsection (2) shall apply to legally conforming lots of record and legally nonconforming lots of record, as defined in chapter 10, in existence at that time of the effective date of the ordinance from which this section is derived or approved by new subdivision of unplatted and undeveloped property after the effective date of the ordinance from which this section is derived. For the purposes of this subsection, lots of record may also be referred to as "properties," "property," or "lots."
(3) For the purposes of this section, the following shall apply:
a. The council hereby adopts the map attached to the ordinance from which this section is derived that depicts the area of application, and the boundary of blocks. The map may be amended by city council resolution and without public hearing.
b. Properties licensed for rental purposes on the effective date of the ordinance from which this section is derived shall be included in the calculation of the number of permitted rental properties in a defined block.
c. If the number of rental properties equals or exceeds the permitted number of rental properties per defined block on the effective date of the ordinance from which this section is derived, no additional rental licenses shall be approved for the block. Existing rental licenses may be renewed and transferred per section 7-27 ; however, should a rental license not be transferred or renewed, or if the rental license is revoked or lapses, the rental license shall not be reinstated unless in conformance with this subsection and other applicable sections of this chapter.
d. Temporary rental license issued per section 7-29 shall be exempt from this section.
e. Rental licenses for state-licensed residences shall be exempt from this section. If the property is no longer licensed by the state, a new rental license application shall be submitted and reviewed for compliance with this section and other applicable sections of this chapter.
f. In the office-residential district located within the city center planning area, as defined in the adopted city center renaissance plan, a rental license may be issued to a lot within a block that exceeds the 25 percent permitted number of rental licenses, provided the ground floors of all principal and accessory buildings on the lot, and any other floors below the ground floor, are occupied and used for a non-rental permitted or conditional use and the rental use of the property is confined to floor areas located above the ground floor.