Londoner v. Denver

Colorado Supreme Court · Administrative Law

210 U.S. 373

Updated July 19, 2026

adminspecial assessmentsdue processmunicipal corporationsboard of public worksconclusive findingspreliminary stepslocal improvements

Facts

The city assessed appellees' property to pay the cost of paving streets in the Eighth Avenue paving district. The owners challenged the assessments on multiple grounds, including the sufficiency of the property-owner petitions, the legality of publication and notice, the adequacy of due process under the charter, the excessiveness of assessments on certain narrow strips, and the validity of the board of public works. The city council's ordinance creating the district expressly found that petitions signed by owners of a majority of the frontage had been presented. The charter also provided for notice, written objections, hearings before municipal authorities, and an assessment method based generally on frontage.

Issue

Whether the paving assessments were invalid because the charter and proceedings failed to provide due process, because preliminary petition and notice requirements were defective, because certain tracts were excessively assessed, or because the board of public works was unconstitutional. Also, whether the city council's findings on preliminary petition facts were conclusive.

Rule

When the legislature authorizes municipal authorities to determine preliminary facts that are not inherently jurisdictional and declares those findings conclusive, those findings cannot later be questioned in court. Due process in special-assessment proceedings is satisfied if property owners receive notice and an opportunity to be heard at some stage on the validity or amount of the assessment before the levy becomes final. An assessment that is merely excessive or erroneous, rather than void, cannot be annulled without the owner's tender of the amount that is justly and equitably due.

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One of 10 multiple-choice questions for this case. Pick an answer to see why.

The charter of the city of Toledo provides that a sidewalk-improvement district may be proposed only after a petition signed by owners of a majority of the assessable frontage is filed with the street bureau. The charter also states that when the city council adopts the district ordinance, its finding that the petition requirement was satisfied is conclusive in every court. After the ordinance passes, Nina Flores sues, alleging the petition actually lacked enough valid signatures.

How should a court rule on Nina's challenge to the sufficiency of the petition?

Explanation. The majority held that when a matter is not inherently jurisdictional, the legislature may commit factfinding on that preliminary step to municipal authorities and make their finding conclusive. A petition requirement of this sort exists only because the charter created it and could have been dispensed with by the legislature, so once the council made the conclusive finding in the ordinance, the fact could not be relitigated.