"Before a site goes under option, what does MHDC actually need documented about it — and does anything in Missouri's environmental rules, floodplain maps, or basis-boost geography already rule the parcel out?"
Where the site documents live now: FIN-125's Site Review category
The 2026 QAP wrote its site-and-zoning requirements directly into its own text. Phase I: Document Review's Secondary Documentation Review section listed them as a single lettered sequence — "b. Site Review Information. MHDC requires multiple site information documents to conduct the site review," followed a few items later by "h. Zoning. Evidence of proper zoning or a letter from the appropriate governmental body describing the process and timeframe for approval of the proper zoning." The 2027 QAP, adopted December 9, 2025, deletes that entire list from the QAP body and replaces it with one sentence: "Applicants must submit the secondary documentation listed in the Application Guide by the application deadline." The Application Guide is the FIN-125 Application Checklist, and it renumbers everything — no more single letters; numbered categories with alpha suffixes instead.
| FIN-125 item | Format | When required |
|---|---|---|
| 12a. Zoning Letter | All applications | |
| 12b. Development Location Map | All applications | |
| 12c. Site Photographs | JPG or Word | All applications |
| 12d. Site Plan or Subdivision Plan | All applications | |
| 12e. Scattered Site Addendum | Excel | Required if development has scattered sites |
| 12f. FEMA Flood Map | All applications | |
| 12g. Previous Environmental Phase I or Phase II Report | Required if the project has had an Environmental Phase I or II completed in the past |
FIN-125 immediately follows Site Review with its own separate "Site Control" category (items 13a-13j — deed, option agreement, title commitment, legal description, and an appraisal or Broker Opinion of Value). Site Review documents what the site is; Site Control documents that the applicant has the legal right to it — the two sit next to each other in the checklist but are not interchangeable, and item 13j (appraisal or BOV) is only triggered when acquisition costs exceed $25,000.
Item 12e's Scattered Site Addendum matters earlier than the application — it is the FIN-125 exhibit for a development structure the QAP itself defines separately. "A development may include multiple buildings if it has similarly constructed units, is located on the same or contiguous tracts of land, is owned by the same federal taxpayer, and is financed pursuant to a common plan of financing... Scattered site buildings on noncontiguous tracts of land may also qualify if the development meets all of the other requirements described above, all buildings in the development can be subject to a single LURA, and the development is 100% rent and income restricted." A screener piecing together two or three non-adjacent parcels into one application needs that three-part test — common financing plan, single LURA, 100% restricted — satisfied before the addendum is worth filling out.
Item 12a's Zoning Letter has its own required format (a letter on the governmental unit's own letterhead, addressed to MHDC's Affordable Housing Division, stating the zoning classification, density requirements, and any conditional-use or overlay restrictions), and the site's broader entitlement path — including the two separate local-jurisdiction notification requirements the QAP layers on top of zoning — is covered in depth in this guide's entitlement-pathway phase. What belongs at the screening stage is simpler: confirm the zoning is already in hand, or budget the time a governmental-body letter describing the path to it will take, before treating a site as application-ready.
Environmental review and siting: MHDC's desk check, Exhibit B, and the one real prohibition
Every application MHDC receives gets an environmental look before the Commission ever votes, whether or not the applicant submits anything environmental at all. "A preliminary environmental review is performed by MHDC on all applications received to assist in the evaluation of project recommendations to MHDC's Board of Commissioners." That preliminary analysis runs per 24 CFR § 58 guidelines across four categories: "Noise analysis (roadways, railroads, airports, other)"; "Floodplains"; "Wetlands"; and "Other - Anything else observed on or around the site or in application information. For example, tank farms, consolidated animal feeding operations (CAFO), sewage areas, dumps, explosive and flammable, quarries, and landmarks." A site with an obvious quarry or CAFO next door can get flagged before a developer spends a dollar on a Phase I.
| Hazard | Threshold that triggers analysis |
|---|---|
| Civil airport | Within 5 miles |
| Military airport | Within 15 miles |
| Road (four lanes or greater) | Within 1,000 feet |
| Railroad | Within 3,000 feet |
| Petroleum or explosive-chemical storage tanks | Within 1 mile |
| Operating or abandoned oil or gas well | Within 300 feet |
| Underground pipeline | Within 600 feet |
None of these are automatic disqualifiers on their own. A site inside a threshold triggers an Acceptable Separation Distance (ASD) calculation from HUD's guidebook "Siting of HUD-Assisted Projects Near Hazardous Facilities" (HUD-1060-CPD): "If the Analyst determines that the proposed project site is not within the ASD, the Analyst may proceed without further regard to this requirement." Only a site that fails the ASD calculation forces an MHDC mitigation-feasibility determination.
What happens after MHDC approves a development splits into two tracks, and the split determines which Phase I ESA rules apply. Developments using HOME, HOME-ARP, National Housing Trust Fund, or HUD/MHDC Risk Share funds go through the full federal track: 24 CFR Part 58 review, entry into HUD's Environmental Review Online System (HEROS), and peer review by an MHDC-contracted third-party Environmental Consultant. Developments with no federal funding — the typical LIHTC-only deal — go through a lighter, state-based track instead: "A less intensive environmental review based on 24 CFR part 58-50 will be conducted on developments with no federal funding... The environmental review will not be subject to the Consultant review, nor will it be entered into HEROS," governed instead by "the Code of State Regulations, 10 CSR 20-4.050," since "Missouri does not require an environmental review comparable nor as comprehensive as NEPA." Both tracks still require the same Phase I ESA, lead-based-paint, asbestos, radon, and vapor-encroachment testing — the difference is who reviews it and where it's filed, not whether it happens.
The Phase I ESA carries a hard shelf life either way: "The Phase I ESA must be conducted (meaning the earliest date of the site visit, or records review, or interviews) within one year of its submission to MHDC," and "a Phase I ESA prepared prior to the MHDC application submission date is not acceptable." On the federally funded track, "any Phase I that was conducted more than 180 days prior to the date of the submission to MHDC, but within the allowable 1-year period, must be updated (pursuant to Sect. 4.6 of ASTM E 1527)." For a federally funded deal still shopping for site control, MHDC's Choice Limiting Actions rule also caps what can be done before the environmental review clears — but "an option agreement on a proposed site or property is allowable prior to the completion of the environmental review... if the option agreement is subject to a determination by the recipient on the desirability of the property for the project as a result of the completion of the environmental review... and the cost of the option is minimal portion of the purchase price," which is exactly the tool a site-sourcing team already relies on for site control.
MHDC's environmental guidance names one absolute, no-exceptions site rule, and it only binds developments using federal financial assistance: "Federal financial assistance for acquisition and construction purposes (including rehabilitation) may not be used in an area identified by FEMA as having Special Flood Hazard Area (SFHA)." A LIHTC-only development with no federal funding does not face that same wall — instead, "MHDC may consider proposals to construct, restore or renovate affordable housing in 100-year and 500-year floodplains," provided the proposal builds in flood mitigation: keeping building improvements, ingress, and egress outside the floodplain wherever possible, flood-mitigation construction features, flood insurance, a funded emergency evacuation and relocation plan, and written notice to prospective residents before they sign a lease. Whether a site is even in a floodplain is established the same way for every applicant regardless of funding source — identifying the parcel on a FEMA Flood Map, the same map that becomes FIN-125 item 12f.
Everything else in the Environmental Compliance Guide that could function as a site-killer — endangered species habitat, wild and scenic river corridors, farmland protection, air-quality non-attainment status — is a consultation-and-documentation process, not a prohibition, and two categories MHDC lists as theoretical concerns don't apply in Missouri at all: "There are no locations in the State of Missouri in the Coastal Barrier Resources System," and for sole-source aquifers, "there are currently no locations in the State of Missouri subject to this requirement." A screener can skip both checks with citation-backed confidence rather than running them defensively on every site.
Eligible basis boost: QCT, DDA, and Missouri's own difficult-development designation
The boost mechanic itself is unchanged from 2026 to 2027: "Developments located in a Qualified Census Tract or in a Difficult Development Area may be eligible to increase eligible basis by up to 30%." What changed is how much the QAP explains about the first two of its three named categories. The 2026 QAP spelled out (a) and (b) in full sentences — "Qualified Census Tract. 9% and 4% applications for developments located in areas designated by HUD as Qualified Census Tracts (QCTs)" and "Difficult Development Areas. 9% and 4% applications for developments located in areas designated by HUD to be difficult to develop" — while the 2027 QAP lists the same two items as bare headers with no explanatory sentence at all. Nothing about the underlying federal designations changed; HUD still publishes the QCT and DDA maps annually the same way it always has. Only the QAP's own restatement of that fact was trimmed.
The third category is where Missouri does its own work, and it's the one the 2027 QAP rewrote substantively, not just cosmetically. Both years let MHDC treat a 9%-Credit property as located in a difficult development area for basis-boost purposes if the property elects the treatment at application and qualifies under a Section III priority — but they define "qualifies" differently. The 2026 QAP named exactly seven qualifying priorities: Preservation Priority, Set-Aside Preference, Permanent Supportive Housing, Vulnerable Persons, Service-Enriched Priority, Veteran's Housing, and Workforce Housing. The 2027 QAP replaces that enumerated list with one sentence: "MHDC may designate properties covered as a Priority under Section III as located in a difficult development area. To qualify for such an increase, a property must make an election at application and meet the requirements of the Priority." Section III of the 2027 QAP now runs ten lettered priorities, not seven — it adds Nonprofit Involvement, HOME CHDO, CDBG-DR, Opportunity Areas, and the 50% Maximum Pilot alongside the priorities the 2026 list already named. Whether MHDC intends the State DDA route to now reach those five newly-unenumerated priorities, or simply restated the same seven-priority intent more generally, is not settled by the text itself.
| Priority | Boost as stated in the 2027 QAP |
|---|---|
| Supportive Housing (Permanent Supportive Housing / Vulnerable Persons) | "9% Applications eligible for up to thirty percent (30%) boost in eligible basis" |
| Veteran's Housing | "9% Applications eligible for up to 30% boost in eligible basis" |
| Workforce Housing | "9% Applications eligible for 30% boost in eligible basis" |
These three priorities carry their own explicit boost language elsewhere in Section III, so they likely don't need the State DDA election at all — which narrows the practical ambiguity above mostly to Nonprofit Involvement, HOME CHDO, CDBG-DR, Opportunity Areas, and the 50% Maximum Pilot.
Site Location scoring in Phase III, and the Phase IV site review
The 2026 QAP scored site geography as one combined category worth up to 15 points — "Site Location, 0-15 points" — with cost-burden/opportunity-area points and a rural-underserved add-on both living inside it. The 2027 QAP splits that same math into two independent categories. "Site Location" is now capped at 10 points, covering only the mutually exclusive Cost Burdened Households / Opportunity Area choice: "Applicants may submit a proposal that meets one or both Cost Burdened Households and Opportunity Area, but points will only be awarded to the highest scoring category that meets all requirements." Rural Underserved is now its own standalone 5-point category, scored independently rather than added on top of Site Location. The combined points available across both is unchanged at 15 — only the category boundary moved.
| Category | Points | Basis |
|---|---|---|
| Site Location — Cost Burdened Households | 10 / 7 / 5 | County's share of severely cost-burdened renter households (spending over 50% of gross income on housing) greater than 20% / 15% / 10% |
| Site Location — Opportunity Area | 7 | Family site meets the QAP's Opportunity Area definition (mutually exclusive with Cost Burdened Households) |
| Rural Underserved | 5 | Site is in an MHDC-designated rural underserved county, published on MHDC's website |
| Preservation | 10 / 12 / 15 | Located in KC or St. Louis region / MSA-Rural or Rural region / existing USDA-RD property (highest-scoring tier only) |
Scoring isn't the last time a site gets evaluated. During Phase IV underwriting, "MHDC staff may conduct a review of each proposed new construction or rehabilitation site ('MHDC Site Review')" that considers "the feasibility, marketability, appropriateness of the site(s) for the intended population, and assessment of any perceived environmental issues," and for rehab or conversion deals "MHDC staff expects to be able to enter the buildings." Every proposed site must carry a sign identifying it as a proposed MHDC development from the time MHDC receives the application until the Commission votes, naming the developer and a contact. Separately, a hard concentration cap attaches at the census-tract level for new construction and conversion proposals: "the proposed development may not be located where the total of publicly subsidized housing units... equal more than twenty percent (20%) of all units in the census tract where the development will be located" — worth checking before a site goes under contract, since it disqualifies on the tract's existing housing stock, not anything about the parcel itself.
What the sources do not settle
Four things are genuinely open in these current-cycle documents, and a Missouri site-screening checklist should flag them rather than guess.
Which Section III priorities the State Designated Difficult Development Area boost actually reaches is not spelled out in the 2027 QAP. The prior year's QAP named seven priorities explicitly; the current QAP's broader "a Priority under Section III" phrasing could mean the same seven, or could newly reach Nonprofit Involvement, HOME CHDO, CDBG-DR, Opportunity Areas, and the 50% Maximum Pilot as well. Neither the QAP nor the FIN-125 checklist resolves it.
The Scattered Site Addendum itself (FIN-125 item 12e, an Excel form linked from MHDC's website) was not among the documents reviewed for this guide, so its specific required fields beyond the QAP's own three-part scattered-site test (common plan of financing, single LURA, 100% rent/income restricted) are unconfirmed.
No FY2027 NOFA application deadline was located in the QAP, FIN-125, or Developer's Guide text reviewed — all three describe the deadline as something the NOFA publishes separately each round, not a date fixed in the governing documents themselves.
The Developer's Guide's preliminary-review "Other" hazard category names tank farms, CAFOs, sewage areas, dumps, and quarries as things MHDC watches for, but — unlike the explosive/flammable and noise categories — no numeric distance threshold for any of them was found in either the Developer's Guide or the Environmental Compliance Guide reviewed for this phase.
Where this goes wrong
- Assuming the zoning and site-documentation requirements still sit inside the QAP's own lettered list (Item h, etc.) the way the outgoing 2026 QAP structured them. The 2027 QAP deleted that list from the QAP body entirely; the current items are FIN-125's Site Review category, items 12a-12g, renumbered and reformatted rather than simply redated.
- Treating FIN-125's "Previous Environmental Phase I or Phase II Report" (item 12g) as the current cycle's environmental submission. It's explicitly limited to a site that had an Environmental Phase I or II completed in the past — the current-cycle Phase I ESA moves through the separate Exhibit B / environmental-review track, not a numbered FIN-125 upload.
- Assuming a Phase I ESA satisfies MHDC just because it exists and is recent. A Phase I dated before the application submission date is unacceptable outright, and on the federally funded track a Phase I must be formally updated under ASTM E1527 §4.6 once it passes 180 days old — 'within a year' is necessary but not sufficient on that track.
- Treating the FEMA floodplain rule as an absolute site-killer for every deal. The hard 'may not be used in a Special Flood Hazard Area' prohibition binds developments using federal financial assistance (HOME, NHTF, Risk Share); a LIHTC-only deal instead faces MHDC's more permissive floodplain-with-mitigation standard.
- Treating the explosive/flammable hazard and noise distance thresholds (1 mile of storage tanks, 300 feet of a well, 600 feet of a pipeline, 1,000 feet of a major road) as automatic disqualifiers. Each triggers an Acceptable Separation Distance calculation and an MHDC mitigation-feasibility determination — a site inside the threshold isn't dead until that determination says so.
- Assuming Qualified Census Tract and Difficult Development Area got redefined in the 2027 QAP because the explanatory sentence under each disappeared. Both are still federal, HUD-designated geographies; only the QAP's own restatement of that fact was trimmed, not the underlying mechanic.
- Assuming every Section III priority automatically qualifies a site for the State Designated Difficult Development Area basis boost now that the 2027 QAP replaced the 2026 QAP's enumerated seven-priority list with the broader, unenumerated 'a Priority under Section III.' Which of the newly-unnamed priorities MHDC actually intends to reach is not spelled out in the current text.
- Scoring a site's location points against the 2026 QAP's combined 0-15-point 'Site Location' category. The 2027 QAP splits that same math: Site Location is now capped at 10 points (Cost Burdened Households or Opportunity Area only), with Rural Underserved carved out as its own separate 5-point category.
- Screening a site purely on parcel-level zoning and environmental factors while missing the census-tract-level concentration cap — a new construction or conversion proposal can't be sited where publicly subsidized units already exceed 20% of all units in that tract, a limit that has nothing to do with the parcel itself.
- HUD
- LIHTC
- State QAPs
- IRS § 42
- Housing Finance Agencies