What Mainzer Aufbaugesellschaft does

Mainzer Aufbaugesellschaft mbH (MAG) is a German urban real estate developer and municipal services provider founded in 1966 as one of Germany's earliest Public-Private-Partnership (PPP) entities, with the City of Mainz as a public shareholder alongside private investors. The company operates four business divisions under one corporate roof: project development (residential, commercial, hotel, mixed-use, special-use buildings), property management and portfolio holding, city-near services (project management, construction supervision, citizen participation for the City of Mainz), and parking space management via its wholly-owned subsidiary PMG Parken in Mainz GmbH, which operates approximately 10,000 parking spaces across 25 facilities.

MAG's revenue mechanics blend four streams: one-time proceeds from development sales to institutional investors (e.g., the 95-unit Darmstadt ensemble sold to DWS Group/RPPF in December 2025), recurring rental income from its held portfolio, recurring parking fee revenue from PMG, and professional service fees for municipal construction supervision and project management. The company also co-develops projects via joint ventures with partners including i Live Group, J. Molitor Immobilien GmbH, EPPLE Holding (emag GmbH JV), Kolb+Partner, and schneider+schumacher. Customer segments span the City of Mainz (municipal mandate), institutional real estate investors (DWS, Commerz Real), corporate end-users (Novo Nordisk, Aareon, Mainzer Volksbank), hotel operators (Hilton, Hyatt, Premier Inn), and private residential buyers through emag.

Technically, MAG integrates sustainable construction practices into its projects (geothermal heating/cooling, photovoltaic facades, green roofs, KfW 40 EE / KfW 55 standards, DGNB Gold targets) and structures complex stakeholder processes including formal citizen participation (Bürgerbeteiligung) for public-space redevelopments. Its geographic footprint spans Mainz, Frankfurt (newest market via We Live Tower), Darmstadt, Saarbrücken, Langen, and Wiesbaden within the Frankfurt RheinMain metropolitan region, with the City of Mainz holding the chair of the Supervisory Board.

Name

Mainzer Aufbaugesellschaft

Legal name

Mainzer Aufbaugesellschaft mbH

Website

https://mag-mainz.de

Company type

Private

Founded year

1966

Operating status

Operating

Headcount range

51–100 employees

Short description

Mainzer Aufbaugesellschaft is a Mainz-based Public-Private-Partnership urban developer active since 1966, executing residential, commercial, and municipal real estate projects across the Frankfurt RheinMain region, managing its own portfolio and ~10,000 parking spaces through subsidiary PMG.

Ownership category

akta.pro rank

Product category

Real Estate Development

NAICS

Nonresidential Property Managers (531312), Real Estate Property Managers (53131)

SIC

Real Estate Agents & Managers (For Others) (6531), Operators Of Nonresidential Buildings (6512)

akta.pro primary industry

Mixed-Use Property Management (BPAJAGAE)

akta.pro secondary industry

Asset & Lifecycle Management (CapEx Planning, Reliability) (BPABAAAI)

Keywords

• Urban real estate development
• Public-private partnership
• Property management services
• Parking infrastructure management
• Municipal construction services

Headquarters

HQ city

Mainz

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. Real Estate Development and Project Sales: MAG develops residential, commercial, and mixed-use properties, then sells completed buildings or ensembles to investors, private buyers, or institutional investors. Revenue is generated through property sales at completion (one-time transaction). Examples: sale of the Darmstadt residential ensemble to DWS Group (RPPF fund), sale of the Jägerhaus residential project to a Mainzer Volksbank subsidiary.
2. Property Management and Portfolio Holding: MAG holds and manages its own real estate portfolio, providing ongoing rental income from commercial and residential tenants across its properties in Mainz and the wider region.
3. Parking Space Management (via PMG): Through its subsidiary PMG Parken in Mainz GmbH, MAG operates approximately 10,000 parking spaces across 25 parking facilities, generating recurring parking fee revenue.
4. Municipal Services and Project Management Fees: MAG acts as construction supervisor, project manager, and developer for municipal clients (Stadt Mainz), earning fees for project management and construction supervision services. Examples include the Kita and Schulsporthalle at Zollhafen (on behalf of the city), and citizen participation management for the Rheingoldhalle project.
5. Joint Venture Development Revenue: MAG enters joint ventures with private partners (e.g., i Live Group, J. Molitor Immobilien GmbH) for co-development, sharing development costs and revenues or proceeds from eventual sales.

Go-to-market motion1 record

Distribution channels5 records

Marketing channels7 records

Core offering

Mainzer Aufbaugesellschaft mbH is a Public-Private-Partnership urban development company that plans, builds, manages, and markets real estate across residential, commercial, mixed-use, hotel, and special-use property classes in Mainz and the Frankfurt RheinMain metropolitan region. Its integrated four-division model covers project development, property management and portfolio holding, city-near municipal services (construction supervision, project management, citizen participation), and parking space management through subsidiary PMG Parken in Mainz GmbH. Revenue is generated through property sales to institutional investors, recurring rental income, parking fees, and fee-based municipal project management services.

Product overview

Mainzer Aufbaugesellschaft mbH (MAG) is a real estate development and urban planning company operating since 1966 as a Public-Private Partnership with the city of Mainz. The company operates four core business divisions: Projektentwicklung (Project Development), Bestandshaltung und Immobilienmanagement (Property Management), stadtnahe Dienstleistungen (City-Near Services), and Parkraummanagement (Parking Space Management via subsidiary PMG Parken in Mainz). MAG offers a diversified portfolio of real estate products and services spanning residential projects (including senior living, student housing, and family homes), commercial office developments, district/quarter developments, special-use facilities (daycare centers, sports halls, event venues), and parking infrastructure management. Key subsidiaries include PMG Parken in Mainz GmbH (parking management with ~10,000 spaces) and emag GmbH (residential development with Epple Holding). The company serves commercial, municipal, and private partners throughout Mainz and the Frankfurt Rhine-Main metropolitan region.

Differentiator

Problem solved

Functional benefit

Brands

• MAG Kommunalbau: Municipal construction services including project management and client representation for public buildings
• MAG Projektentwicklungs

Products and services

• Project Development (Projektentwicklung) End-to-end real estate development service covering residential, commercial, mixed-use, hotel, office, retail, and special-use facilities in Mainz and the Frankfurt RheinMain metropolitan region. Projects are delivered either for the company's own portfolio or for sale to institutional investors, corporate tenants, or private buyers.
• Property Management and Portfolio Holding (Bestandshaltung und Immobilienmanagement) Management, maintenance, and rental of MAG's owned portfolio of residential, commercial, and mixed-use properties across Mainz and the region, providing recurring rental income.
• City-Near Services (Stadtnahe Dienstleistungen) Fee-based municipal services for the City of Mainz including construction supervision, project management, client representation, and citizen participation process management for public infrastructure and civic buildings.
• PMG Parking Space Management Operation of approximately 10,000 parking spaces across 25 parking facilities in Mainz city center, including acquisition, renovation, and ongoing operational management of parking houses. Operated through subsidiary PMG Parken in Mainz GmbH.
• emag Residential Development Residential real estate development including terraced houses for young families and full quarter developments with emphasis on urban planning and sustainability. Operated through 50/50 joint venture emag GmbH with EPPLE Holding GmbH.
• MAG Kommunalbau GmbH Municipal Construction Services Municipal construction services subsidiary of MAG providing project management, client representation, and construction supervision for public-sector building projects.
• MAG Projektentwicklungs GmbH Project Development Project development subsidiary of MAG focused on hotel, office, and mixed-use real estate ventures, including the 175-room Premier Inn hotel in Saarbrücken with a 20-year lease agreement.

Quantifiable outcome

• Successfully delivered the Rheingoldhalle renovation in 38 months, on schedule for January 2022 handover
• +3 more outcomes

Named customers8 records

Segments5 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration3 records

Feature4 records

Partnerships

Nine partnerships are on record, tiered core, supporting and secondary.

• i Live Group GmbHcoreStrategic or Co-development Partner · 27 May 2025MAG and i Live Group are joint venture partners for the We Live Tower Frankfurt project (Lyoner Straße 14), transforming an 18-story office tower into 364 apartments (220 Micro-Living and 144 Serviced Apartments under the Rioca brand) with a 6-group kindergarten and ~1,800 sqm of new construction. DGNB Gold certification is targeted. This is MAG's first project in Frankfurt, marking its strategic expansion into the broader Frankfurt RheinMain region.
• KOKONSULT (Kristina Oldenburg)supportingImplementation/ SI/ Consulting Partner · 1 January 2025MAG engaged KOKONSULT (led by Kristina Oldenburg) to facilitate the citizen participation process ('Mein JO!') for the Jockel-Fuchs-Platz redevelopment, including online surveys, Spurgruppen workshops, and citizen dialogues. KOKONSULT designed the engagement methodology and managed the process through to completion in November 2025.
• NAI apollo real estate GmbH & Co. KGsupportingImplementation/ SI/ Consulting Partner · 1 January 2025NAI apollo real estate GmbH & Co. KG acted as advisor to MAG on the sale of the Darmstadt residential ensemble to DWS Group, providing market advisory and transaction support.
• schneider+schumacher Weiterbauen GmbHsecondaryStrategic or Co-development Partner · 1 January 2023schneider+schumacher Weiterbauen GmbH won the MAG-organized realization competition in May 2023 for the Kita and Schulsporthalle project at the Mainzer Zollhafen, with their winning design selected from competing entries.
• Zollhafen GmbH & Co.KGsecondaryStrategic or Co-development Partner · 1 January 2022MAG purchased a 4,233 sqm plot at the Mainzer Zollhafen from Zollhafen GmbH & Co.KG in June 2022 to develop a kindergarten and 3-field school sports hall (construction start planned for 2026, completion 2029). The city of Mainz will lease the building upon completion and holds a purchase option.
• Kolb+Partner (Dieburg)secondaryStrategic or Co-development Partner · 1 January 2019MAG and Kolb+Partner from Dieburg jointly acquired a ~24,000 sqm site at Berliner Allee and Haardtring in Darmstadt's city center, developing ~316 apartments, ~368 micro-apartments, and ~3,500 sqm of office/commercial space in 13 new buildings and two existing buildings. Approximately one quarter of residential area serves subsidized housing.
• J. Molitor Immobilien GmbHcoreStrategic or Co-development Partner · 1 January 2012J. Molitor Immobilien GmbH is a recurring JV partner with MAG across multiple projects including: Innovationspark Kisselberg (GmbH & Co. KG), Taubertsberg III (TB3), Gartenquartier, Wohnquartier Rodelberg (via WTR GmbH & Co. KG), Isaac-Fulda-Allee (Aareon and Novo Nordisk buildings), and Aranda-Quartier Langen (via emag). The partnership has produced over a dozen joint projects since at least 2012.
• EPPLE Holding GmbHcoreStrategic or Co-development Partner · 1 January 2011EPPLE Holding GmbH co-owns the emag GmbH subsidiary with MAG (50/50 joint venture). emag specializes in demanding residential projects from row houses for young families to full quarter developments, with emphasis on urban planning, sustainability, and affordable financing options.
• PMG Parken in Mainz GmbHcoreStrategic or Co-development Partner · 1 January 1983PMG Parken in Mainz GmbH is a wholly-owned subsidiary of MAG focused on parking space management. It operates ~10,000 parking spaces across 25 parking facilities in Mainz, with 8 owned outright and the remainder managed under lease or management agreements. MAG's CEO Ralf Sadowski also serves as CEO of PMG, and Dr. Sirid Theilen also serves as commercial managing director of PMG.

Scale indicators5 records

Recent moves9 records

Expansion highlights5 records

Broad incumbents

• Hochtief AG: Major German construction and real estate development group (ACS-owned), active in commercial and mixed-use development. Comparable to MAG's nonresidential development capability but as a global infrastructure-led incumbent rather than municipal-focused PPP.
• Vonovia SE: Europe's largest residential real estate company with significant German exposure across portfolio management, development, and property services. Overlaps with MAG's residential management and development activities but at vastly greater scale and listed status.
• STRABAG Real Estate GmbH: Real estate arm of the European STRABAG construction group, developing residential, office, and hotel projects in German metropolitan areas. Comparable to MAG's mixed-use and project development mandate with broader geographic and capital reach.

Direct peers

• BauProjekt Leipzig GmbH: Municipal urban development company owned by the City of Leipzig, executing project development, portfolio management, and city-near services. Comparable in PPP-like municipal mandate, integrated real estate model, and citizen-oriented urban development focus.
• ABG Frankfurt Holding GmbH: Frankfurt's municipal real estate developer and housing company, operating as a similar public-interest urban developer with a portfolio spanning residential, commercial, and mixed-use developments. Closely comparable to MAG's PPP-style mandate and Frankfurt RheinMain focus.
• Nassauische Heimstätte | Wohnstadt: One of Germany's largest state-affiliated housing and development companies (Hessen), engaged in residential development, portfolio management, and urban regeneration across the RheinMain region — a near-direct functional analog to MAG's mixed-use development and Bestandshaltung model.
• GWH Bauprojekte GmbH: Hessian municipal housing company developing residential and mixed-use properties in the RheinMain region, with a portfolio holding and project development model structurally similar to MAG's Bestandshaltung und Immobilienmanagement division.

Emerging players

• Instone Real Estate Group SE: German residential real estate developer focused on urban infill and mixed-use projects in German metropolitan areas. Comparable in product type and ESG positioning, though Instone is a publicly listed specialist while MAG is PPP-anchored.
• Pandion AG: Cologne-based residential and mixed-use developer with a portfolio of urban quarter developments in German cities. Comparable in residential/mixed-use project development profile, with similar sustainability positioning but focused on North Rhine-Westphalia.

Regional players

• SAGA Siedlungsaktiengesellschaft Hamburg: Hamburg's municipal housing company managing and developing a large residential portfolio with mixed-use components. Operates a comparable integrated housing-and-development model but focused on northern Germany rather than RheinMain.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInde.linkedin.com/company/mainzer-aufbaugesellschaft-mbh
• Instagraminstagram.com/mag_mainz

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles10 records

Subsidiaries8 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Mainzer Aufbaugesellschaft