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Surplus Invest
S.A. Lüdke's ALP.X Group develops and advises on real assets across Munich, Berlin, and Miami, managing 1,000+ apartment portfolios and mixed-use projects.
Surplus Invest
ALP.X Group was founded in Munich by S.A. Lüdke, an investment professional whose career spanned UBS M&A in London, BCG's Principal Investors & Private Equity task force, and Swiss private-markets manager Partners Group. The firm launched as a development, holding, and advisory company in the real assets space, a hybrid structure that combines proprietary development capabilities with asset management and underwriting services. From its Munich headquarters, ALP.X now maintains additional offices in Berlin and Miami, reflecting a deliberate geographic pairing of German metropolitan real assets and US Sun Belt real estate. ALP.X operates three verticals — Real Estate, Infrastructure, and Corporate Growth — each of which functions both as a service provider and a principal investor. In real estate, the firm acts as developer, asset manager, and investment manager, aiming to build independent long-term holdings. Confirmed positions include a joint venture with PineBridge Benson Elliot and Fundament Advisory for a portfolio of over 1,000 period and neo-classical apartments in Berlin; a mixed-use neighborhood development in Frankfurt alongside Marco Polo Capital and OMUNITI; the advisory mandate for Timehouse Munich, a premium serviced-apartments operator; and the Cloud One Hotel & Residences development in Wynwood, Miami. US acquisition profiles extend to hospitality and mixed-use, residential and specialty office, and renewable energy infrastructure up to USD 10M. Infrastructure and Corporate Growth verticals mirror the same service-plus-holdings logic, with the latter providing board representation and corporate venture capital portfolio management. The firm lists 14 team members spanning Munich, Berlin, Miami, and New York. Partners C. Stransky-Greifensfels and Dr. F. Closset co-founded OMUNITI, a German real estate and infrastructure project developer, creating a structural link between ALP.X's advisory platform and an on-the-ground development shop. Industry advisors include R. Büschl, former CEO of the Büschl Unternehmensgruppe, one of Munich's largest project developers with 1.2 million m² of managed development area. No publicly disclosed AUM or total deployment figure exists, consistent with a firm that emphasizes service mandates and selective principal commitments over blind-pool fund management. ALP.X's structure as a development-holding-advisory hybrid is its primary differentiator. The firm does not market pooled funds or report quarterly valuations; it collects service fees, holds assets, and develops projects directly. This architecture lets ALP.X source deals through advisory mandates and development joint ventures rather than relying on intermediated auction processes. The dual presence in German core cities and select US growth markets creates a targeted cross-border pipeline that few firms of comparable headcount replicate.
General information
Firm type
Private Equity
Year founded
—
AUM
Undisclosed
Location
Region
Europe
Country
Germany
City
Munich
Corporate office
Munich, Germany
Additional offices
Berlin, Germany · Miami, FL, United States
Principals
S. A. Lüdke
CEO & Founder
M. Büschl
COO & Head of Corporate Growth
C. Stransky-Greifensfels
Partner
Dr. F. Closset
Partner
A. Caretti
Partner
Sector focus
Frequently asked questions
Who runs investment decisions at Surplus Invest?
CEO and Founder S.A. Lüdke leads investment decisions, supported by a partnership group that includes M. Büschl (COO and Head of Corporate Growth), C. Stransky-Greifensfels, Dr. F. Closset, and A. Caretti. The firm has not disclosed a separate investment committee. Mr. Lüdke's background includes Partners Group and BCG's Principal Investors & Private Equity practice.
How does Surplus Invest source proprietary deal flow?
ALP.X sources opportunities through three integrated verticals — real estate, infrastructure, and corporate growth — each of which offers advisory, development, and asset management services. These service mandates create visibility into off-market projects. The firm's partners also co-founded OMUNITI, a German real estate project developer, providing a direct pipeline of development-stage deals in the Berlin and Frankfurt regions.
Is Surplus Invest structured as a single family office or does it operate more like a venture firm?
ALP.X is neither. The firm operates as a development, holding, and advisory company in the real assets space. It does not aggregate third-party capital into closed-end funds or report AUM. The model generates returns through service fees, direct project development, and selectively held long-term assets, without a venture capital or family office mandate.
Does Surplus Invest participate in fund commitments or only direct deals?
The firm has not publicized any fund-of-funds or LP commitments. Its disclosed activities are all direct — joint ventures with institutional partners like PineBridge Benson Elliot, advisory mandates such as Timehouse Munich, and development projects like the Cloud One Hotel & Residences in Miami. There is no evidence of GP staking or blind-pool fund investments.
What investment stages does Surplus Invest typically target?
The Altss research record originally flagged early-stage and growth venture, but the firm's own public materials describe a real-asset developer and advisor with no stated venture-stage framework. Portfolio evidence points to development and repositioning projects — such as condominiumization of a monument-protected Munich residential block and mixed-use neighborhood ground-up developments — rather than startup equity rounds.
Which sectors does Surplus Invest explicitly avoid?
The firm's website identifies three active verticals and acquisition profiles limited to hospitality, residential, office, parking, renewable energy infrastructure, and mixed-use. There is no mention of operating-company buyouts, biotech, software, or consumer brands. ALP.X appears to focus exclusively on real estate and infrastructure development, with its Corporate Growth vertical reserved for advisory services related to corporate venture capital portfolios, not direct operating-company investing.
How is ALP.X Group related to OMUNITI?
Partners C. Stransky-Greifensfels and Dr. F. Closset co-founded OMUNITI, a Germany-based real estate and infrastructure project developer. OMUNITI co-invests with ALP.X in projects such as the mixed-use neighborhood development in Frankfurt, where it appears alongside Marco Polo Capital. This gives ALP.X a direct development execution arm without fully consolidating it under the parent brand.
Profile maintained by Altss using OSINT (open-source intelligence), regulatory filings, licensed data partners, and verified direct submissions. Read the methodology. Last updated: . Continuous refresh with full update cycles at least every 30 days.
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