Sullivan Mermel

Investment decisions are made exclusively by co-founders John Sullivan and David Mermel. Sullivan's background includes 16 years at LaSalle Investment Management, where he served as a managing director focused on US real estate acquisitions. Mermel was a senior vice president at Harrison Street, a firm managing over $55 billion in alternative real assets. No investment committee or external advisor layer sits between the partners and a capital commitment.

The firm relies on the partners' institutional networks built over two decades at LaSalle and Harrison Street. Deal flow comes through operator relationships, broker networks in major US markets, and direct sponsor outreach. Because the firm can close quickly using partner equity without waiting on a fund-level capital call, it positions itself as a speed-first capital provider in competitive processes.

It is a single family office at its core — the firm invests partner capital and does not manage committed outside funds. However, it operates with a private equity posture on sourcing and underwriting, and brings institutional co-investors into specific deals on a per-asset basis. There is no blind-pool fund, no LP commitments, and no pressure to deploy on a fund-cycle timeline.

The firm focuses almost entirely on direct deals — acquiring operating real estate, originating structured credit, and making selective venture investments. There is no public record of Sullivan Mermel committing to third-party commingled funds. The partners prefer control over asset-level economics and the ability to underwrite each deal independently.

The firm concentrates on major US markets with Sun Belt exposure confirmed through public transaction records. A 2023 acquisition in Phoenix, Arizona signals a preference for high-growth metros with favorable demographic tailwinds. The partners' prior institutional experience spans national platforms, suggesting capability across multiple US regions.

No publicly disclosed philanthropic entity or donor-advised fund structure is associated with Sullivan Mermel as of the latest available records. The firm appears to organize its activities entirely through the investment office.

The firm actively co-invests but deals are structured transaction-by-transaction rather than through a standing co-investment vehicle. In its 2023 Phoenix multifamily acquisition, Sullivan Mermel partnered with a Texas-based family office — an arrangement that likely gave both parties direct asset-level economics without intermediary fees. Each co-investor negotiates terms separately per deal.