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<br />JUDICIAL REACTION <br /> <br />UU~;:L~(\ <br /> <br />51 <br /> <br />5':"341.20 <br /> <br />341.10 Zoning <br />~~t~ . Subdivision ordinances commonly,require com- <br />, <br /> <br />pliance with minimum lot sizes and other zoning standards. <br />This may be an important flood plain requirement because f10od- <br />way restrictions on fill and structures are usually set out <br /> <br />in zoning regulations, not subdivision controls. Some enabling <br /> <br />statutes specifically require plat compliance with zoning <br />regulations. 55 One case upheld a two aore minimum lot size <br /> <br />zoning requirement for a proposed subdivision in a flood-prone <br /> <br />area,56 but some other cases have invalidated large lot size <br /> <br />requirements. 57 <br /> <br />Plats approved by planning boards are vulnerable to sup- <br /> <br />t h ... l' 58 <br />sequel' _ c angp.", J.n zonJ.ng requ .atlons ' <br /> <br />s~ch as incr~a~~c <br /> <br />,minimum lot size requirements. Courts have genere.1ly held that <br />.. .. 59 <br />developers.have no vested rights in pre-exJ.stJ.ng zonJ.ng. <br /> <br />For this reason, the legislatures of some states nave adopted. <br /> <br />statutes protecting the landowner with a recorded plat against <br /> <br />zoning amendments for a specified time period, usually two.or <br /> <br />three years.60 <br /> <br />341.20 Official Maps <br /> <br />Official maps are precise maps "adopted pursuant <br />to specific authority, showing existing a'-.oj proposed streets, <br />highways, drainage systems,. and other public improvements.,,6l <br /> <br />Official mapping is a device ad~pted separately from zoning <br />regulations and master plans and is designed primarily to <br />prevent costly improvements in proposed streets which will <br />increase future condemnation costs. Some statutes expressly <br />~l~~ permit official mapping of drainageways and parks.62 Most <br />