German Real Estate Depreciation & Restnutzungsdauer MCP server

Rundum Immo Real Estate Appraisal MCP

An open-source Model Context Protocol server for indicative German real-estate depreciation and purchase-price allocation. It exposes calculatepropertydepreciation and calculatepurchaseprice_allocation, delegating both calculations to the public AfAMax APIs. Proprietary appraisal formulas remain in AfAMax.

<!-- mcp-name: immo.rundum/real-estate-appraisal -->

Hosted server

The public Streamable HTTP endpoint is:

https://mcp.rundum.immo/mcp

No end-user API key is required. Calls are subject to AfAMax per-client and service-wide rate limits and abuse protections.

Run from source over stdio

Node.js 22.12 or newer is required.

git clone https://github.com/Rundum-Immo/real-estate-appraisal-mcp.git
cd real-estate-appraisal-mcp
pnpm install --frozen-lockfile
pnpm build

Configure your MCP client to run the built server, replacing the path with the absolute path to your checkout:

{
  "mcpServers": {
    "rundum-real-estate-appraisal": {
      "command": "node",
      "args": ["/absolute/path/to/real-estate-appraisal-mcp/dist/transports/stdio.js"]
    }
  }
}

The stdio server calls the anonymous AfAMax API directly. Its public limits are 30 requests per minute and 500 requests per rolling day per IP; a tenant-wide ceiling may also apply. It writes protocol messages only to stdout and operational logs only to stderr.

Install from npm over stdio

Node.js 22.12 or newer is required. Configure your MCP client to launch the published package with npx:

{
  "mcpServers": {
    "rundum-real-estate-appraisal": {
      "command": "npx",
      "args": ["-y", "@rundum-immo/real-estate-appraisal-mcp"]
    }
  }
}

Tools

Property depreciation

calculatepropertydepreciation accepts the complete public AfAMax request contract:

• Required: property type, construction year, and floor area.
• Optional: purchase price, land area, standard land value, inventory, purchase costs, core-renovation year, marginal tax rate, locale, coarse modernization level, and eight detailed modernization component states.
• Results: annual and monthly AfA, comparison with statutory AfA, estimated tax savings, building-value assumptions, modernization points, and remaining useful life.

Omitting modernization data means AfAMax assumes no modernization, producing an upper-bound estimate. For multi-unit buildings, provide whole-building figures or calculate individual units separately. Results are indicative and do not replace tax, legal, or appraisal advice.

Example input:

{
  "propertyType": "CONDOMINIUM",
  "constructionYear": 1970,
  "floorArea": 85,
  "purchasePrice": 350000,
  "taxRate": 0.42,
  "locale": "en"
}

Purchase-price allocation

calculatepurchaseprice_allocation divides acquisition costs between non-depreciable land and the depreciable building using the German Federal Ministry of Finance (BMF) method.

• Required: property type, total purchase price, purchase date, construction year, floor area, land area, and standard land value.
• Condominiums also require the numerator and denominator of the co-ownership share.
• Mixed-use residential/commercial buildings also require whether the commercial share is under or over 50%.
• Optional: purchase costs, included inventory, garage and underground-parking counts, monthly net cold rent, and locale.
• Results: the applied method, meaningful alternatives, land/building shares and values, depreciation base, unavailable or unusable method reasons, and disclosed asset-method defaults.

Shortened. The full README is on GitHub.