Safe Harbor: From Rockland Slips to a Marine Ecosystem‍

Introduction

On a summer morning in Rockland, Maine, the economics of a modern marina can appear deceptively simple. A forty-five-foot yacht lies alongside a dock in Penobscot Bay. Its owner pays for a slip, electricity, perhaps winter storage, and occasionally fuel or repairs. The marina provides a place to keep the boat, and the customer pays for the privilege. At first glance, it looks like a straightforward real-estate transaction.

In reality, the relationship between a marina and its customer can be considerably more valuable. A boat owner does not merely need a place to park a yacht. The vessel requires fuel, storage, maintenance, haul-outs, repairs, detailing, winterization, electronics, mechanical work, and other services. The owner also travels, visits other marinas, and eventually buys, sells, upgrades, or replaces the boat. A marina operator that captures only the slip fee behaves primarily as a landlord. An operator that captures a larger share of the customer's boating expenditures begins to operate as a customer-centered service platform.

Safe Harbor Marinas illustrates this transformation particularly well. Its Rockland, Maine, marina provides the local setting for understanding a much larger corporate story: the acquisition of Safe Harbor by Sun Communities in 2020, its subsequent sale to Blackstone Infrastructure for $5.65 billion in 2025, and Blackstone's proposed acquisition of MarineMax in 2026. Together, these transactions reveal a strategy based on acquiring scarce waterfront assets, consolidating a fragmented industry, retaining boat owners through a membership network, and increasing the amount of revenue generated from each customer.¹

The story becomes particularly clear when considered through the hypothetical journey of a forty-five-foot yacht based in Rockland. The owner leaves Maine, cruises south through the United States, travels through the Caribbean and potentially into South America, returns to the United States through a Florida port of entry, and then cruises north again to Maine. The yacht may travel thousands of nautical miles, but from the perspective of the marina business, the customer relationship remains continuous.

I. Safe Harbor Rockland: The Local Foundation

Safe Harbor Rockland is located on Ocean Street in Rockland Harbor and is part of the larger Safe Harbor marina network. The facility accommodates a broad range of vessels, from smaller recreational boats to yachts as large as approximately two hundred feet, with a published maximum draft of thirteen feet.² Its services extend well beyond dockage. The marina offers wet slips, winter storage, transient accommodations, haul-out and repair capabilities, and technical services involving engines, propulsion, electrical systems, electronics, carpentry, fiberglass, metalwork, painting, plumbing, refrigeration, heating, air conditioning, detailing, and winterization.³

The physical amenities reinforce the idea that the marina is more than a parking facility. Safe Harbor Rockland provides shore power, water, pump-out, Wi-Fi, showers, laundry, parking, security features, recreational amenities, and a waterside restaurant.⁴ For a yacht owner, these services represent a series of potential transactions attached to the same physical asset.

This distinction is economically important. A marina has a fixed amount of waterfront space. There are only so many slips, and additional waterfront cannot necessarily be created when demand increases. Consequently, the operator has two broad ways of growing revenue. It can increase the amount earned from each slip, or it can increase the amount spent by each customer who occupies the slip.

The second strategy is central to understanding Safe Harbor.

II. Sun Communities and the $2.1 Billion Acquisition

The modern corporate history of Safe Harbor took a major turn in 2020 when Sun Communities agreed to acquire the business. Sun announced the transaction in September 2020 at an approximately $2.11 billion valuation.⁵ The acquisition closed on October 30, 2020. At closing, Sun reported that Safe Harbor consisted of ninety-nine owned-and-operated marinas, together with additional managed facilities, and served approximately forty thousand boat owners across twenty-two states.⁶

Sun Communities was already a large publicly traded real-estate investment trust whose principal businesses were manufactured-housing communities and recreational-vehicle resorts. Safe Harbor gave Sun a third major property category: marinas. But the investment was not simply about adding waterfront real estate to a property portfolio.

Sun saw Safe Harbor as a platform. Its acquisition materials emphasized recurring revenue, attractive coastal locations, the fragmented nature of the marina industry, and the opportunity for continued acquisitions and growth.⁷ The marina business possessed characteristics that were attractive to an institutional owner: scarce real estate, recurring customer payments, opportunities for ancillary services, and potential economies of scale.

This is where the business begins to look different from a conventional landlord.

A manufactured-housing community primarily monetizes the residence and the land relationship. A marina can monetize the boat, the land, the water access, the customer's travel, and the maintenance of a high-value physical asset. The customer relationship can therefore extend well beyond the rent paid for a slip.

III. From Real Estate to Customer Lifetime Value

The key concept underlying the Safe Harbor model is customer lifetime value.

Consider a hypothetical owner of a $1 million yacht. The customer may pay for a long-term slip at Rockland, but that is only one component of the owner's annual boating budget. The yacht may also require winter storage, haul-outs, maintenance, repairs, fuel, detailing, electronics, mechanical work, and other services.

Suppose, purely for illustration, that the annual slip revenue associated with a forty-five-foot yacht were approximately $10,000. That does not mean the customer's economic value to the marina is $10,000. If the same customer spends another $15,000, $20,000, or $30,000 on services, fuel, storage, and other boating activities, the marina has a substantially larger economic relationship with that owner.

The strategy can therefore be expressed simply: acquire the customer, keep the customer, service the customer, get more spending from the customer, and keep the relationship for many years.

That is the underlying logic of the Safe Harbor membership program.

IV. Safe Harbor Membership: Keeping the Customer Inside the Network

Safe Harbor's membership program provides an important mechanism for turning individual marina customers into network customers. Under the current 2026–27 program, qualifying customers generally have a signed slip or storage agreement with Safe Harbor and must satisfy the program's requirements.⁸ Short-term transient customers do not simply become members by arriving at a marina.

Once the qualifying relationship exists, however, membership can extend beyond the home marina. The program provides benefits that include complimentary transient stays at participating Safe Harbor locations, subject to availability and program limitations. The current rules limit complimentary stays to three consecutive nights and establish additional conditions governing eligibility and use.⁹ Members also receive fuel-related benefits, access to member experiences, merchandise discounts, and assistance from a membership concierge.¹⁰

This is strategically significant.

Imagine that the owner of the hypothetical forty-five-foot yacht keeps the boat at Safe Harbor Rockland. Without a network, Rockland is simply the customer's home marina. With a network, Rockland can become the customer's home base in a much larger system.

The owner can leave Maine and travel south. Along the way, the customer may use other Safe Harbor facilities. The home marina has therefore become an entry point into a broader network of transactions.

The company has effectively transformed a local customer relationship into a network relationship.

V. The Forty-Five-Foot Yacht: Maine to South America

The economics become easier to understand when applied to an actual cruising scenario.

Imagine a forty-five-foot yacht based at Safe Harbor Rockland. In late spring, the owner departs Maine and begins a southbound voyage. The yacht might travel down the New England coast, through the Mid-Atlantic, toward the Chesapeake and eventually Florida. From Florida, the owner could continue through the Bahamas and Caribbean and, depending on the vessel's design and operating capabilities, eventually reach the northern coast of South America.

The exact itinerary would depend heavily on the yacht. A forty-five-foot coastal motor yacht is not automatically suitable for an ocean passage. Range, fuel capacity, hull design, redundancy, communications, navigation equipment, weather capability, safety equipment, crew experience, and the season all matter. A long-range trawler, cruising sailboat, and high-speed motor yacht would have substantially different capabilities.

The important point for the business analysis is not the precise route. It is what happens to the customer relationship while the boat is away from Rockland.

The owner still needs dockage. The owner still needs fuel. The boat still requires maintenance. The owner may require storage, repairs, provisioning, or other services. If the yacht visits other Safe Harbor marinas, the customer's relationship with the company travels with the boat.

This is the network effect of the membership model.

The customer's geographic location changes, but the customer relationship does not.

VI. Returning to the United States Through Florida

Eventually, the yacht returns to the United States.

Suppose the owner returns through Florida after cruising in South America and the Caribbean. Because the yacht is arriving from abroad, the owner must report the arrival to U.S. Customs and Border Protection. The people aboard and the vessel are subject to the applicable inspection and entry procedures.¹¹

For the hypothetical U.S.-citizen owner, this is the formal point at which the foreign voyage becomes a U.S. entry. The owner does not simply sail into Florida and continue north without reporting the international arrival.

After the yacht and persons aboard have completed the required CBP process and have been cleared into the United States, however, the character of the voyage changes. The yacht is again moving domestically. There is no routine immigration or Customs clearance every time it enters another state.

The owner can therefore proceed north through Georgia, South Carolina, North Carolina, Virginia, New Jersey, New York, Connecticut, Rhode Island, Massachusetts, and Maine.

The Coast Guard is a separate matter. For a U.S.-flagged private recreational vessel of the type contemplated here, the return from a foreign country does not ordinarily create a second Coast Guard customs-style clearance at every domestic port. The Coast Guard's Notice of Arrival requirements apply to specified categories of vessels, while U.S.-flagged noncommercial vessels generally fall outside that particular reporting requirement.¹²

The owner can therefore return to Rockland, where the same yacht that began the journey may once again enter its home slip.

From the customer's perspective, it has been a voyage.

From Safe Harbor's perspective, it has been a continuous customer relationship.

VII. Blackstone Acquires the Platform

The next chapter began in 2025.

Sun Communities announced in February 2025 that it would sell Safe Harbor to affiliates of Blackstone Infrastructure for $5.65 billion in cash.¹³ The transaction represented a dramatic increase over the approximately $2.0 billion Sun had paid when the original acquisition closed in 2020.¹⁴ The sale was completed in stages during 2025, with the final delayed-consent properties transferred later that year.¹⁵

Sun characterized the transaction as an opportunity to unlock substantial value while allowing the company to concentrate on its core manufactured-housing and recreational-vehicle businesses. The transaction also demonstrated the extent to which the Safe Harbor platform had appreciated under Sun's ownership.

Blackstone, however, was buying something different from what Sun had originally purchased.

It was buying a mature marina platform with an established network, a large customer base, recurring revenue, and the ability to grow through acquisitions and additional services. Blackstone described Safe Harbor as the largest marina and superyacht servicing business in the United States and emphasized its intention to invest in existing properties and expand the business.¹⁶

The transaction therefore represents an important change in ownership but also a continuity of strategy.

Sun demonstrated that Safe Harbor could be consolidated and grown.

Blackstone now has the opportunity to determine how much further that platform can be developed.

VIII. MarineMax and the Next Stage of the Strategy

The proposed acquisition of MarineMax provides perhaps the clearest indication of where the business could be headed.

In August 2026, MarineMax and Safe Harbor announced a definitive agreement under which Safe Harbor would acquire MarineMax in an all-cash transaction with an enterprise value of approximately $1.5 billion.¹⁷ The transaction remains subject to closing conditions and therefore should not be treated as completed as of October 2026.

MarineMax is strategically important because it expands the relationship with the customer beyond marina ownership and service. MarineMax operates boat and yacht dealerships as well as marina, storage, service, brokerage, and related marine businesses.¹⁸

The combination potentially creates a much broader customer lifecycle. A customer may begin as a prospective yacht buyer, with MarineMax participating in the initial purchase. Once the customer owns the yacht, however, the relationship can continue through Safe Harbor, which can provide the marina slip, storage, fuel, maintenance, repairs, and other services required to operate the vessel. As the customer travels, the Safe Harbor network can provide additional transient destinations and services. Eventually, when the owner decides to sell, trade, or upgrade the yacht, MarineMax can potentially participate in that transaction as well. The relationship has therefore expanded from dockage to ownership, creating the possibility of a substantially broader and more valuable economic relationship with the customer over the full life cycle of boat ownership.

IX. The Customer as the Asset

The most useful way to understand the Blackstone strategy is to reverse the traditional view of the marina.

The traditional view is that the marina owns the waterfront and rents slips to boat owners.

The emerging platform model is that the marina owns or controls access to scarce waterfront and uses that relationship to serve the entire boating lifecycle of the customer.

The difference is substantial.

A forty-five-foot yacht owner may be worth far more to the business than the annual rent associated with the slip. The owner may purchase fuel, storage, maintenance, repairs, detailing, haul-out services, transient dockage, and other products. The owner may travel to other marinas within the network. The owner may eventually purchase another yacht.

This is why the membership program matters.

Membership gives the customer a reason to remain within the network.

The network gives Safe Harbor more opportunities to monetize the customer.

The customer generates more revenue.

That revenue supports further acquisitions and investment.

Additional marinas make the network more useful.

The more useful the network becomes, the more valuable the membership proposition becomes.

This produces a reinforcing cycle:

More marinas → more member destinations → stronger customer retention → more customer spending → greater cash flow → more investment and acquisitions → more marinas.

X. The Rockland Customer as the Business Model

Return to the hypothetical owner in Rockland.

The customer begins with a forty-five-foot yacht and a long-term slip. The relationship starts with a physical piece of real estate: a place to keep the boat.

But the customer then becomes a member.

The yacht leaves Rockland.

It travels south.

It may use other Safe Harbor facilities.

It purchases fuel.

It receives maintenance.

It eventually reaches Florida and then the Caribbean or South America.

The owner returns to the United States through a Florida port of entry and completes the required CBP process.

The yacht travels north again.

It returns to Maine.

It comes back to Rockland.

It may undergo maintenance and winterization.

The cycle begins again.

From the owner's perspective, this is simply the life of a boat owner.

From Blackstone's perspective, it is a recurring revenue ecosystem.

The customer has not been acquired once. The customer has been acquired repeatedly across different stages of the boating lifecycle.

Conclusion

Safe Harbor's evolution from a collection of marinas into a broader marine platform demonstrates how an apparently simple real-estate business can become a customer-lifetime-value business.

The story begins in places such as Rockland, Maine, where a boat owner needs a safe place to keep a forty-five-foot yacht. Sun Communities recognized in 2020 that the underlying marina business offered recurring revenue, scarce waterfront real estate, and opportunities for consolidation. Sun acquired Safe Harbor for approximately $2.1 billion, expanded the platform, and ultimately sold it to Blackstone for $5.65 billion.¹⁹

Blackstone inherited a much larger opportunity than simply owning a collection of docks. It acquired a network, a customer base, an operating platform, and a membership model designed to keep boat owners inside that network.

The proposed MarineMax acquisition points toward the next stage. If completed, the combination could allow Safe Harbor to participate not only in where a customer keeps a boat, but also in how the customer buys, services, travels with, maintains, and ultimately replaces that boat.

The forty-five-foot yacht provides the simplest illustration. It can leave Rockland, travel south through the United States, continue through the Caribbean and potentially South America, return through a Florida port of entry, and then travel domestically back to Maine. Its owner may move thousands of miles, but the business relationship can remain centered on Safe Harbor.

That is ultimately the logic of the model: get the customer, keep the customer, give the customer more places to go, provide more of what the customer needs, capture more of the customer's spending, and keep the relationship for the life of the boat—and potentially for the life of the boater.

The dock in Rockland is therefore more than a parking space.

It is the beginning of a customer relationship that can extend from Maine to Florida, from Florida to South America, and from one yacht to the next.

Notes

1. Sun Communities, Inc., “Sun Communities, Inc. Announces Sale of Safe Harbor Marinas to Blackstone Infrastructure in an All-Cash Transaction for $5.65 Billion,” February 24, 2025, 1; Blackstone, “Blackstone Infrastructure to Acquire Safe Harbor Marinas in $5.65B Transaction,” February 24, 2025, 1.

2. Safe Harbor, “Safe Harbor Rockland,” accessed October 6, 2026, webpage, no pagination.

3. Ibid.

4. Ibid.

5. Sun Communities, Inc., “Sun Communities, Inc. to Acquire Safe Harbor Marinas, LLC for $2.1 Billion,” September 29, 2020, 1.

6. Sun Communities, Inc., “Sun Communities, Inc. Closes Acquisition of Safe Harbor Marinas,” October 30, 2020, 1.

7. Sun Communities, Inc., “Sun Communities, Inc. to Acquire Safe Harbor Marinas, LLC for $2.1 Billion,” 1.

8. Safe Harbor, “Membership Rules,” 2026–27, webpage, no pagination.

9. Ibid.

10. Ibid.

11. U.S. Customs and Border Protection, “Reporting Requirements for Pleasure Boats,” current guidance, 1.

12. U.S. Coast Guard, National Vessel Movement Center, “Frequently Asked Questions,” current guidance, 1.

13. Sun Communities, Inc., “Sun Communities, Inc. Announces Sale of Safe Harbor Marinas to Blackstone Infrastructure in an All-Cash Transaction for $5.65 Billion,” 1.

14. Sun Communities, Inc., “Sun Communities, Inc. Closes Acquisition of Safe Harbor Marinas,” 1; Sun Communities, Inc., “Sun Communities, Inc. to Acquire Safe Harbor Marinas, LLC for $2.1 Billion,” 1.

15. Sun Communities, Inc., Annual Report and Securities and Exchange Commission filings concerning the Safe Harbor disposition, 2025, 1.

16. Blackstone, “Blackstone Infrastructure to Acquire Safe Harbor Marinas in $5.65B Transaction,” 1.

17. MarineMax, Inc., and Safe Harbor Marinas, “MarineMax Enters into Definitive Agreement to be Acquired by Blackstone Infrastructure Portfolio Company, Safe Harbor, in a $1.5 Billion All-Cash Transaction,” August 10, 2026, 1.

18. Ibid., 1.

19. Sun Communities, Inc., “Sun Communities, Inc. to Acquire Safe Harbor Marinas, LLC for $2.1 Billion,” 1; Sun Communities, Inc., “Sun Communities, Inc. Announces Sale of Safe Harbor Marinas to Blackstone Infrastructure in an All-Cash Transaction for $5.65 Billion,” 1.

Bibliography

Blackstone. “Blackstone Infrastructure to Acquire Safe Harbor Marinas in $5.65B Transaction.” February 24, 2025.

MarineMax, Inc., and Safe Harbor Marinas. “MarineMax Enters into Definitive Agreement to be Acquired by Blackstone Infrastructure Portfolio Company, Safe Harbor, in a $1.5 Billion All-Cash Transaction.” August 10, 2026.

Safe Harbor. “Membership Rules.” 2026–27.

Safe Harbor. “Safe Harbor Rockland.” Accessed October 6, 2026.

Sun Communities, Inc. “Sun Communities, Inc. Announces Sale of Safe Harbor Marinas to Blackstone Infrastructure in an All-Cash Transaction for $5.65 Billion.” February 24, 2025.

Sun Communities, Inc. “Sun Communities, Inc. Closes Acquisition of Safe Harbor Marinas.” October 30, 2020.

Sun Communities, Inc. “Sun Communities, Inc. to Acquire Safe Harbor Marinas, LLC for $2.1 Billion.” September 29, 2020.

Sun Communities, Inc. Annual Report and Securities and Exchange Commission filings concerning the Safe Harbor disposition. 2025.

U.S. Customs and Border Protection. “Reporting Requirements for Pleasure Boats.” Current guidance.

U.S. Coast Guard, National Vessel Movement Center. “Frequently Asked Questions.” Current guidance.