Change of Use for Former Government Buildings — Three Legal Walls and How to Break Through Them

As municipalities nationwide advance to the implementation phase of their Public Facility Comprehensive Management Plans, repurposing former government buildings has become a primary challenge. Cases of converting former city halls into welfare facilities, community centers, or private-sector offices are increasing alongside government consolidation and relocation.

However, the seemingly simple act of "using a vacated building for a different purpose" involves three legal hurdles in complex interaction:

1. Building Standards Act — Change-of-use confirmation application (Article 87)
2. Fire Service Act — Retroactive application of fire equipment requirements
3. Seismic Retrofit Promotion Act — Seismic retrofit for pre-1981 buildings

These three walls appear independent but are actually interconnected — clearing one while failing on the other two is a common project failure pattern. This article deconstructs each wall's structure and presents practical breakthrough strategies.

---

Article 87 Structure

Building Standards Act Article 87 governs change of use. When an existing building's use is changed to any of the special building categories listed in Appended Table 1(a), and the floor area subject to change exceeds 200㎡, a confirmation application is required.

What Are Special Buildings?

Special buildings listed in Appended Table 1(a) include:

Former government buildings are typically classified as "offices" — not special buildings. However, when the conversion target falls into the special building categories above, confirmation application becomes mandatory.

Change-of-Use Decision Flowchart

Former government building (office) conversion
    │
    ├─→ Target use is NOT a special building (office → office, etc.)
    │    → Confirmation NOT required
    │
    ├─→ Target use IS a special building
    │    │
    │    ├─→ Floor area subject to change is 200㎡ or less
    │    │    → Confirmation NOT required (but BSA compliance obligations remain)
    │    │
    │    └─→ Floor area subject to change exceeds 200㎡
    │         → Confirmation REQUIRED
    │
    └─→ Change between similar uses (government-designated)
         → Confirmation NOT required

Similar-Use Changes

Changes between "similar uses" designated in Building Standards Act Enforcement Order Article 137-19 are exempt from confirmation regardless of floor area. Similar-use groups include:

• Theater ↔ Cinema ↔ Performance hall
• Hotel ↔ Ryokan
• Museum ↔ Gallery ↔ Library

Conversions from former government buildings (offices) to welfare facilities or commercial uses do not qualify as similar-use changes, so confirmation applications are generally required.

When No Completion Certificate Exists

The most vexing issue in former government building change-of-use is missing completion certificates. Buildings constructed before 1998 have low completion certificate acquisition rates, making the "legal compliance confirmation" prerequisite for confirmation applications difficult.

MLIT established guidelines in July 2014 providing a procedure through "legal compliance surveys" by designated inspection organizations. However, these surveys require several million yen and several months — costs that must be incorporated into early-stage project planning.

---

The Retroactive Application Principle

Unlike the Building Standards Act, the Fire Service Act retroactively applies new standards to existing buildings in certain circumstances. Specifically, when a change of use creates a "Specified Fire Prevention Object," retroactive application is the default rule.

What Are Specified Fire Prevention Objects?

Among fire prevention objects defined in Fire Service Act Enforcement Order Appended Table 1, facilities used by unspecified large numbers of people are classified as "Specified Fire Prevention Objects":

Former government buildings (offices) are "non-specified fire prevention objects." Converting to welfare facilities (Category 6) or hotels (Category 5-a) triggers retroactive application of fire equipment requirements.

Key Retroactively Applied Fire Equipment

Pre-Consultation with the Fire Department

The scope of Fire Service Act application during change of use is confirmed through pre-consultation with the jurisdictional fire department. This consultation should precede the confirmation application and cover:

1. Fire prevention object classification for the converted use
2. List of retroactively applied fire equipment
3. Whether existing equipment can be utilized
4. Documents required for fire department consent

---

Pre-1981 vs. Post-1981 Seismic Standards

From the perspective of the Seismic Retrofit Promotion Act, buildings fall into two categories:

Most former government buildings were constructed in the 1960s–1970s and fall under the pre-1981 standard.

Obligations Under the Seismic Retrofit Promotion Act

The Act imposes a best-effort obligation on owners of existing non-conforming buildings (pre-1981 standard) to conduct seismic diagnosis and retrofit (Article 14). Additionally, mandatory diagnosis is required for:

• Large-scale buildings used by unspecified large numbers (urgently needed safety confirmation)
• Existing non-conforming buildings along emergency transport routes (traffic obstruction risk)

Former government buildings may not qualify as "unspecified large-number use" in their current form, but converting to welfare facilities or hotels may bring the converted use within the mandatory scope.

The Is-Value Metric

Seismic diagnosis results are evaluated using the Is-value (Structural Seismic Index):

For change of use, achieving an Is-value of 0.6 or above is required in principle. When the Is-value falls short, seismic reinforcement is necessary — with costs varying significantly by building scale, structural type, and deterioration level.

Reinforcement Methods and Cost Estimates

---

Strategy 1: Avoiding Walls Through Use Selection

The target conversion use dramatically changes the height of legal hurdles:

The lowest-barrier option is "leasing as office space without changing use." No confirmation application, no fire retroactive requirements in principle. However, this represents limited utilization from a PPP/PFI perspective.

Strategy 2: Staged Development

Rather than clearing all three walls simultaneously, a phased approach is effective:

Phase 1: Seismic diagnosis (establish Is-value) Phase 2: Seismic reinforcement (achieve Is-value 0.6+) Phase 3: Fire department pre-consultation (determine retroactive scope) Phase 4: Confirmation application (execute change of use) Phase 5: Interior renovation and fire equipment installation

Strategy 3: Subsidy and Grant Utilization

Change-of-use costs can be partially offset through:

---

Background

Shimoda City began considering city hall reconstruction around 2009. The 2011 Great East Japan Earthquake made relocation from the tsunami inundation zone an urgent priority.

The Pivot — From New Construction to Renovation

While new construction at the Kawachi district was initially planned, fiscal constraints triggered a 2021 pivot. Seismic diagnosis of the soon-to-close Inaozawa Junior High School confirmed structural soundness, leading to the decision to renovate the school building into municipal offices.

Three critical factors in this pivot:

1. Confirmed seismic adequacy: School buildings have often undergone seismic reinforcement since 1981, frequently maintaining adequate Is-values
2. Favorable change-of-use profile: School → office (non-special building) conversion is relatively straightforward — no confirmation application required in principle
3. Cost reduction: Renovation achieved significant cost savings versus new construction

The Change of Use in Practice

Conversion from school (special building, Appended Table 1(3)) to office (non-special building) does not constitute a change to a special building, so confirmation application is not required in principle.

However, the following were necessary:

• Fire Service Act: Schools and offices have different fire prevention object classifications, requiring fire equipment review
• Accessibility: Barrier-free modifications required for municipal office use
• Equipment renewal: Electrical, plumbing, and HVAC systems upgraded to office specifications

Timeline

---

The three walls of the Building Standards Act, Fire Service Act, and Seismic Retrofit Promotion Act confront every municipality considering public facility conversion. But these walls are not insurmountable.

What matters is accurately measuring the walls' height in advance. The choice of target use dramatically changes that height. Welfare facility conversion faces all three walls at maximum height; leasing as office space faces virtually none. As Shimoda showed by choosing school-to-office, wall height can be minimized through intelligent use selection.

"What you convert to" determines 90% of the legal hurdle landscape. We recommend beginning change-of-use considerations with this principle firmly in mind.

---

Related Articles

Guide

Building Code Compliance for Closed School Reuse

Legal analysis specific to school building change of use

Guide

Selecting PPP Methods by Fiscal Capacity Index

Optimal solutions across five tiers from 0.3 to beyond 1.0

Guide

Cost Structure of Closed School Renovation

Market rates and cost reduction strategies

---

References

Explanatory Guide on Relaxation Measures for Existing Buildings (2nd Edition) (2025)

Act on Promotion of Seismic Retrofitting of Buildings (2025)

On the Retroactive Effect of the Fire Service Act (2024)

Shimoda City New City Hall Construction (2024)