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Provisions like these require a commitment to enforcement that is often a challenge for local planning and building departments, which are frequently underfunded. One simple mechanism for enforcement is to send a letter to the landlord every year that must be signed and returned attesting to his or her adherence to the income limit, a practice Santa Cruz adopted. II. Standards A. Minimum Lot Size in Single -Family (and Town House) Zones This section addresses the lot sizes required forADU installation. Local governments have often imposed excessive minimum lot sizes forADUs, which greatly restricts the number ofADUs in a community. In a survey of 50 ordinances for the 2000 edition of the Model State ADUAct and Local Ordinance, the minimum lot size requirement varied from 4,500 square feet to 1 acre (APA 1996). One community allowed detached ADUs only on lots that were 1.5 times the minimum lot size of the zoning district (Orange County, Florida, Zoning Code Sec. 38-1426 (f)(4). Some communities have the some minimum lot -size requirements for all ADUs. As a policy matter, it should not be necessary to establish a separate qualifying lot size forADUs if the purpose is to assure the retention of landscaping and privacy between homes, because the setback and lot coverage standards can achieve those objectives. The language below requires that the minimum sized lot required for an ADU is the some as the minimum lot size for the primary dwelling. There is one exception: ADUs may be created within or attached to an existing house on lots smaller than the minimum lot size if there is an existing house on the lot. It also allows ADUs to be built concurrently with or before the primary residence (for reasons discussed in notes to the alternative definitions for accessory dwelling units). This provision also addresses the issue of legally platted lots made nonconforming by the imposition of subsequent lower -density zoning, something that occurred in many cities in the middle of the 20th century. Accessory Dwelling Units may be created on any lot that meets the minimum lot size required for a single-family dwelling (or town houses). Attached and internal accessory dwelling units may be built on any lot with a single- family dwelling (or town house) that is nonconforming solely because the lot is smaller than the minimum size, provided the accessory dwelling units would not increase the nonconformity of the residential use with respect to building height, bulk or lot coverage. B. Types of Structures Many off -site manufactured and modularADUs have been and continue to be produced, old conceptions of what constitutes a manufactured or modular home have become outdated. The Model Local ADU Ordinance provision maximizes the opportunities forADUs by allowing any type of structure to be an ADU if that structure is allowed as a principal unit in the zoning district. A manufactured or modular dwelling unit may be used as an accessory dwelling unit in any zone in which accessory dwelling units are permitted. 36 1 HARP - Accessory Dwelling Units: Model State Act and Local Ordinance