What a board can actually do with this

The realistic path for most Missouri associations is not to sue in the association's name. It is to organise the affected owners as plaintiffs.

1. Check the association's IRS determination letter before telling members anything. If the association holds a 501(c)(3) determination, it qualifies and the organisational route is open. If it is a 501(c)(4) or files as a taxable nonprofit — the common case — it does not, and a suit filed in the association's name under subsection 4(2) is exposed to a standing challenge at the threshold.
2. Identify owners within 1,200 feet. Subsection 3 (damages, including diminution in value) and subsection 4(1) (injunctive relief) are both open to any owner inside that radius, with no tax status required. In a typical subdivision that is a dozen or more households, and the association can help them coordinate without being the plaintiff.
3. Get a municipal citation first. This is the cheapest and highest-value step, because of the prima facie shortcut:

   “7. When a property owner or neighborhood organization brings an action under this section for injunctive relief to abate a nuisance, a prima facie case for injunctive relief is made upon proof that a citation has been issued by the county, city, or village with jurisdiction over the property… An action for injunctive relief to abate a nuisance shall be heard by the court without a jury and shall not require proof that the party bringing the action has sustained damage or loss as a result of the nuisance.”

   A citation converts the injunction case into a documents case, removes the jury, and removes the need to prove damage. A call to code enforcement is worth more than a month of board correspondence.
4. Serve the 60-day notice exactly as specified, or lose two months. It must go to the tenant — or to “occupant” if the tenant cannot be reasonably ascertained — at the property address, and to the owner of record at the last known address on file with the county or city, and where the owner is an entity, to its registered agent at the agent's address of record. It must state that a nuisance exists and that legal action may follow if it is not eliminated within 60 days, and it must specify four things: the act or condition, the date the nuisance was first discovered, the address and the location on the property, and the relief sought.
5. Know about the fee award, and that it is discretionary. “When a property owner or neighborhood organization bringing the action prevails in such action, such property owner or organization may be entitled to an award for attorneys' fees and expenses, based on the amount of time reasonably expended, as ordered by the court, which award … shall be entered as a judgment against the owner of the property on which the act or condition constituting the nuisance occurred.” It is a real prospect, not a guarantee.

The defence the statute builds in

A defendant who pleads and proves that the condition is the subject of an order of the Department of Natural Resources, the U.S. Environmental Protection Agency, or the Missouri Attorney General, and that the property is in compliance with that order as to that condition, has an affirmative defence. For an association dealing with a contaminated or environmentally regulated parcel, that is the answer it will meet.

Two other limits are express: the section “shall not be construed as to abrogate any equitable or legal right or remedy otherwise available under the law to abate a nuisance” — so common-law private nuisance and the declaration's own enforcement provisions survive intact — and it “shall not be construed to grant standing for an action challenging any zoning application or approval.” It is not a tool for fighting a rezoning.

The other half of House Bill 199

The same act extended the pre-existing St. Louis City and Kansas City nuisance-action procedures in Chapter 82 to two more cities. Per the official House summary, sections 82.1025 to 82.1031 now reach “any home rule city with a population between 160,000 and 200,000 inhabitants and any home rule city with a population between 71,000 and 79,000 inhabitants” — Springfield and St. Joseph. Certain injunction actions may now be heard without a jury. And critically, attorney-fee awards that had been available only in actions against owners of commercial or industrial property are now available in actions against owners of residential property.

So the geography for Missouri associations is: the new section 67.452 route in St. Louis County and its municipalities; the Chapter 82 route in St. Louis City, Kansas City, Springfield and St. Joseph; and elsewhere in the state, common-law nuisance plus the declaration.

Sequence it with the LLC affidavit

Both this route and Missouri's newly extended responsible-natural-person affidavit run through St. Louis County, and both start with a municipal citation. For a board facing an absentee-LLC problem house, the workable order is: code complaint, then citations, then contact with the registered agent, then a section 347.048 affidavit naming a human with management control (or a circuit-court petition to compel one), then the section 67.452 notice, then suit by the owners within 1,200 feet.

What to watch next

Whether anyone tries the 501(c)(3) question. The most likely test is a St. Louis County subdivision association that does hold a charitable determination, or a separately incorporated 501(c)(3) neighbourhood association layered over an HOA — a structure that is common in St. Louis city neighbourhoods and rare in county subdivisions. Until then, the practical rule for boards is the one at the top: the owners sue, not the association.