Appellee Ford Motor Company distributes its automobiles through a nationwide network of independently-owned dealerships. Appellants Mary Haire and Ernest B. Haire, III (the Haires) are shareholders of Ernie Haire Ford, Inc. (EHF), an automobile dealership located in Tampa, Florida. ^[1] Appellant Auto Assets Trust (Auto Assets) was to serve as a broker in a proposed transaction. Appellants claim Appellee is liable, under Florida law, for its refusal to approve the proposed transaction. The district court granted summary judgment to Appellee. We affirm.

I. BACKGROUND

We set forth the facts in the light most favorable to Appellants. On March 31, 1985, Appellant EHF and Appellee entered in a Ford Sales and Service Agreement (Dealership Agreement), which was amended on January 5, 1994. On September 5, 1996, EHF and Appellee executed a Dealer’s Facility Supplement (Supplement). The Dealership Agreement and the Supplement contain three provisions pertinent to this case.

First, section 5(b) of the Dealership Agreement states that the dealership location is described in the Supplement, which in turn specifies two addresses on North Florida Avenue in Tampa as the location for EHF’s dealership. Second, section 5(c) in the Dealership Agreement provides in part:

[EHF] shall not move or substantially modify or change the usage of any of the DEALERSHIP LOCATION or FACILITIES ..., nor shall [EHF] ... directly or indirectly establish or operate in whole or in part any other locations or[*1289] facilities ... without the prior written consent of [Appellee], (emphasis added)

Third, section 9(a) in the Dealership Agreement provides:

[Appellee] reserves the right to determine, from time to time, in its best judgment, the numbers, locations and sizes of authorized dealers necessary for proper and satisfactory sales and service representation ... within and without the DEALER’S LOCALITY. In making such determinations, [Appellee] from time to time conducts, to the extent deemed adequate by [Appellee] and subject to the ready availability of information, studies of the locality, including such factors as geographic characteristics, consumer shopping habits, competitive representation patterns, [etc.] .... (emphasis added).

Throughout 1997 and 1998, EHF negotiated a transfer of its dealership to Car-Max, a non-party. Under the proposed transaction, the Haires would sell their shares in EHF to Auto Assets, which in turn would sell EHF’s operating assets, including the Dealership Agreement, to CarMax. The proposed transaction also called for the relocation of the dealership from North Florida Avenue to CarMax’s superstore on Bearss Avenue. The transaction was conditioned on Appellee’s approval of both the transfer and relocation of the dealership.

In October 1998, EHF requested Appel-lee’s approval for the proposed transaction, including the transfer of the dealership to CarMax and the relocation to Bearss Avenue. In December 1998, Appellee disapproved the relocation to Bearss Avenue, and because the transfer was conditioned on the relocation, Appellee also disapproved the transfer to CarMax. Contemporaneously, to ensure the transaction would not be consummated, Appellee filed a verified complaint with Department of Highway Safety and Motor Vehicles (DHSMV) pursuant to Fla. Stat. § 320.643; the sole basis for Appellee’s verified complaint was its objection to the proposed relocation. Shortly thereafter, CarMax terminated the proposed transaction, and the DHSMV dismissed the verified complaint as moot.

In their lawsuit before the district court, Appellants presented a plethora of evidence about Appellee’s motive for rejecting the proposed transaction. For instance, as early as the late 1970s or early 1980s, and then again in late 1995 or early 1996, Appellee had suggested that EHF’s dealership be moved to Bearss Avenue. Nevertheless, in early 1998, Appellee tried to persuade Appellants not to transfer the dealership to CarMax, despite admitting that the Bearss Avenue location had several advantages over the North Florida Avenue location. At an August 1998 meeting, Appellee informed CarMax that it would not approve the transaction even if Car-Max offered to operate the dealership at the North Florida Avenue location. Prior to rejecting the transaction, Appellee performed a limited amount of due diligence; in particular, Appellee requested far less information from CarMax than it normally requested from other proposed transferees. Additionally, had Appellee adhered to its own relocation manual, nine of the ten factors listed therein favored the Bearss Avenue location.

Appellee presented evidence of several reasons supporting its refusal to approve the relocation and transfer. For example, the proposed relocation conflicted with Ap-pellee’s market plan, which encompassed placing a new dealership in a different area of Tampa. Moreover, Appellee did not want to move EHF from the “auto row” on North Florida Avenue, and it believed the Bearss Avenue location was near some undesirable businesses. Additionally, Appellee feared the relocation[*1290] would generate protest litigation by other dealerships pursuant to Fla. Stat. § 320.642. Lastly, Appellee did not want EHF’s new-car dealership co-located with CarMax’s used-car superstore.

II. STANDARD OF REVIEW

We review a grant of summary judgment de novo, with all facts and reasonable inferences construed in the light most favorable to the nonmoving party. See, e.g., Harbert Int’l, Inc. v. James, 157 F.3d 1271, 1277 (11th Cir.1998). This case requires us to examine issues concerning the substantive law of Florida. In rendering a decision based on state substantive law, a federal court must “decide the case the way it appears the state’s highest court would.” E.g., Royal Ins. Co. of Am. v. Whitaker Contracting Corp., 242 F.3d 1035, 1040 (11th Cir.2001) (internal quotations and citation omitted). Where the state’s highest court has not spoken to an issue, a federal court “must adhere to the decisions of the state’s intermediate appellate courts absent some persuasive indication that the state’s highest court would decide the issue otherwise.” Ins. Co. of N. Am. v. Lexow, 937 F.2d 569, 571 (11th Cir.1991) (internal quotations omitted).

III. DISCUSSION

Appellants claim Appellee is liable, under Florida law, for (1) a breach of contract, (2) a violation of Fla. Stat. § 320.643 (1997), and (3) tortious interference with contract. We examine each of these contentions. ^[2]

A. Breach of Contract

To support their breach of contract claims, ^[3] Appellants make two arguments. First, they argue that Appellee did not use “its best judgment,” contrary to section 9(a) of the Dealership Agreement, when it rejected the relocation and the transfer of the dealership. Second, Appellants argue Appellee violated the implied covenant of good faith and fair dealing.

For their first argument, Appellants concede that, under sections 5(b) & (c) of the Dealership Agreement, any relocation of the dealership from its North Florida Avenue location required Appellee’s written consent. Appellants nonetheless argue that the “best judgment” clause of section 9(a) modified Appellee’s discretion when approving or rejecting a proposed relocation. To comply with “best judgment” clause, Appellants say that Appellee was required to “gather sufficient information and perform an analysis to have a proper basis to exercise its ‘best judgment’ and at least follow its own guidelines and procedures.” Appellant’s Br. 24. Whether Ap-pellee did this, Appellants argue, is a question of fact for the jury.

We disagree. As the district court noted, it is well settled that “when the terms of a voluntary contract are clear and unambiguous, ... the contracting parties are bound by those terms, and a court is powerless to rewrite the contract to make it more reasonable or advantageous for one of the contracting parties.” Emer [*1291] gency Assocs. of Tampa, P.A. v. Sassano, 664 So.2d 1000, 1003 (Fla. 2d DCA 1995); accord Institutional & Supermarket Equip., Inc. v. C & S Refrigeration, Inc., 609 So.2d 66, 68 (Fla. 4th DCA 1992); Nat’l Health Labs., Inc. v. Bailmar, Inc., 444 So.2d 1078, 1080 (Fla. 3d DCA 1984). The district court correctly characterized the plain meaning of the Dealership Agreement and section 9(a):

Under the [Dealership] Agreement, it is [Appellee’s] own judgment that controls, not EHF’s judgment, not a jury’s judgment and not a reasonable business person’s judgment. [Section 9(a)] merely requires that [Appellee] use its best judgment in determining the relocation of its dealerships. This clear and unambiguous provision cannot be interpreted as opening the door for a jury to second-guess [Appellee’s] judgment or as setting limits on [Appellee’s] reasons for making a relocation determination.

Turning to Appellants’ second argument, the implied covenant of good faith and fair dealing is a part of every contract under Florida law. See Burger King Corp. v. Weaver, 169 F.3d 1310, 1315 (11th Cir.), cert. dismissed 528 U.S. 948, 120 S.Ct. 370, 145 L.Ed.2d 287 (1999). But the implied covenant cannot override an express contractual term. See Ins. Concepts And Design, Inc. v. Healthplan Servs., Inc., 785 So.2d 1232, 1234 (Fla. 4th DCA 2001) (citing Weaver, 169 F.3d at 1317-18). Rather than serving as an independent term within a contract, the implied covenant “attaches ... to the performance of a specific contractual obligation.” Johnson Enters. of Jacksonville, Inc. v. FPL Group, Inc., 162 F.3d 1290, 1314 (11th Cir.1998) (quoted in Ins. Concepts, 785 So.2d at 1235). In this case, the specific contractual obligation upon which Appellants rely is section 9(a)’s “best judgment” clause; therefore, the proper inquiry is to what extent, if any, does the implied covenant modify the broad discretion accorded Appellee under the “best judgment” clause.

With the implied covenant, one party cannot capriciously exercise discretion accorded it under a contract so as to thwart the contracting parties’ reasonable expectations. See Sepe v. City of Safety Harbor, 761 So.2d 1182, 1185 (Fla. 2d DCA 2000) (holding that, even where one party has “sole discretion” under a contract, that party, in exercising its discretion, must act in good-faith and in accordance with the contracting parties’ expectations); Cox v. CSX Intermodal, Inc., 732 So.2d 1092, 1097-98 (Fla. 1st DCA 1999) (stating “where the terms of the contract afford a party substantial discretion ..., the duty to act in good faith ... limits that party’s ability to act capriciously to contravene the reasonable contractual expectations of the other party”). Yet, the limit placed on a party’s discretion is not great. As the Florida Second District Court of Appeal has stated, “Unless no reasonable party ... would have made the same discretionary decision ..., it seems unlikely that [the party’s] decision would violate the covenant of good faith-” Sepe, 761 So.2d at 1185.

According to Appellants, the Cox decision by the Florida First District Court of Appeal controls the outcome of this case. 732 So.2d at 1094-1099. In Cox, two truckers contracted with CSX to haul freight. See id. at 1094. CSX had exclusive rights to the truckers’ services, thereby prohibiting the truckers from hauling non-CSX freight. See id. But the contract expressly stated CSX had no obligation to provide any specific freight to the truckers. See id. The truckers sued for breach of contract, claiming CSX was routinely giving them only low-paying freight to haul. See id. CSX argued that the contract gave it complete discretion in the assignment of freight, and it was under no obligation to assign any freight to the[*1292] truckers. Notwithstanding CSX’s broad discretion under the contract, the First District Court of Appeal reversed a summary judgment, holding that issues of fact remained as to whether CSX had acted in good faith in assigning freight. See id. at 1097-98.

Appellants’ reliance on Cox is misplaced. The central purpose of the contract in Cox was the hauling of freight. By failing to assign freight, CSX frustrated that purpose and the reasonable expectations of the parties. Here, however, the central purpose of the Dealership Agreement was to sell cars, not to relocate the dealership. In disapproving the relocation, Appellee did not preclude Appellants from selling cars. Instead, based on “its best judgment,” Appellee forbid the relocation of the dealership to a site where, granted, Appellants would have financially benefítted. Although Appellee’s decision was not in Appellants’ best interests, it was neither capricious nor in contravention of the parties’ reasonable expectations. Therefore, the district court properly granted summary judgement on Appellants’ breach of contract claims.

B. Fla. Stat. § 320.643 (1997) 4

Section 320.697 of the Florida Statutes provides a cause of action to “[a]ny person who has suffered pecuniary loss or who has been otherwise adversely affected because of a violation by a licensee of [Fla. Stat. §§ ] 320.60-320.70.” Appellants contend that Appellee, a licensee, ^[5] is liable under § 320.697 for violating Fla. Stat. § 320.643.

We recently explained how § 320.643 functions:

Section 320.643 provides a mechanism to regulate the transfer of dealer franchise agreements and equity interests. A licensee ... is entitled to written notice of any such transfer. To object to the transfer, a licensee must file a verified complaint with the DHSMV no later than 60 days after receiving notice. The available grounds for objection differ depending on the type of transfer. For a transfer of a franchise agreement, a licensee, under § 320.643(1), may not unreasonably withhold its approval, and all objections to the transfer—other than objections to the transferee’s moral character or business experience—are presumed to be unreasonable. In contrast, for a transfer of the equity interest, a licensee, under § 320.643(2)(a), may object solely on the ground that the transferee lacks good moral character. ^[6]

Risley v. Nissan Motor Corp. USA, 254 F.3d 1296, 1299 (11th Cir.2001). What we did not mention in Risley, as it was not pertinent there, is that a transfer of a franchise agreement is not valid “unless the transferee agrees in writing to comply with all requirements of the franchise then in effect.” Fla. Stat. § 320.643(1).

In this case, Appellants were proposing both a transfer of EHF’s equity[*1293] interest (that is, the sale of EHF’s stock from the Haires to Auto Assets) and a transfer of the EHF’s franchise agreement (that is, the transfer of EHF’s operating assets from Auto Assets to CarMax). Appellee disapproved the entire transaction because it was conditioned on the relocation of the dealership from North Florida Avenue to Bearss Avenue. Appellants contend this disapproval violated both § 320.643(1), which governs transfers of franchise agreements, and § 320.643(2)(a), which governs transfers of equity interests.

Appellants’ claims under § 320.643(1) are foreclosed by Gus Machado Buick-GMC Truck, Inc. v. General Motors Corp., 623 So.2d 810 (Fla. 1st DCA 1993). In that case, an automobile dealer proposed a transfer of the franchise agreement coupled with a relocation. See id. at 811-12. The licensee disapproved, contending, as Appellee does here, that the proposed transfer was invalid under Fla. Stat. § 320.643(1) because the relocation was a failure to comply with the franchise agreement. See id. Stated differently, the transferee refused to “comply with all requirements of the franchise then in effect.” Fla. Stat. § 320.643(1). In the administrative proceeding, the DHSMV agreed, and the Florida First District Court of Appeal affirmed, holding that a proposed franchise transfer which contemplates a relocation can fail to comply with the “franchise then in effect” and thus be invalidated by § 320.643(1). See Gus Machado, 623 So.2d at 812, 813.

In this case, the “franchise then in effect” (that is, the Dealership Agreement) plainly articulated that EHF’s dealership had to be located at North Florida Avenue. Appellants’ proposed transaction did not comply with this requirement, and thus it was invalid under § 320.643(1). Hence, Appellee could not have violated § 320.643(1) when it disapproved a transaction which, by its plain terms, was invalid under § 320.643(1). ^[7]

Turning to Appellants’ argument under § 320.643(2)(a), the Florida Supreme Court has recognized that where a proposed transaction is solely an equity transfer, then § 320.643(2)(a) may provide the exclusive basis for a licensee to disapprove the transaction. See Hawkins v. Ford Motor Co., 748 So.2d 993, 1000-01 (Fla.1999). Nonetheless, a proposed transaction “cannot be viewed in a vacuum.” Id. at 1001. Where a proposed transaction involves more than the “sterile transfer of an equity interest”, then “[§] 320.643(2)(a) does not provide the exclusive basis for objection.” Id.

In this case, the proposed transfer of EHF’s equity from the Haires to Auto Assets was inextricably intertwined with the transfer of EHF’s franchise agreement from Auto Assets to CarMax. Thus, Appellee was free to disapprove the entire proposed transaction under either § 320.643(1) or § 320.643(2)(a). ^[8] Since it[*1294] properly disapproved the transaction under § 320.643(1), Appellee could not have violated § 320.643(2)(a).

In sum, as a matter of law, Appellee did not violate § 320.643. Therefore, the district court properly granted Appellee summary judgment on Appellants’ claims alleging a violation of § 320.643.

C. Tortious Interference with Contract

Under Florida law, a claim for tortious interference with contract cannot lie where the alleged interference is directed at a business relationship to which the defendant is a party. Genet Co. v. Annheuser-Busch, Inc., 498 So.2d 683, 684 (Fla. 3d DCA 1986) (citing Ethyl v. Balter, 386 So.2d 1220, 1225 (Fla. 3d DCA 1980)). In other words, “the interfering defendant must be a third party, a stranger to the business relationship.” Salit v. Ruden, McClosky, Smith, Schuster & Russell, P.A., 742 So.2d 381, 386 (Fla. 4th DCA 1999) (citing Abruzzo v. Haller, 603 So.2d 1338 (Fla. 1st DCA 1992)).

Genet, decided by the Florida Third District Court of Appeal, is materially indistinguishable from the instant case. 498 So.2d at 683-85. In Genet, the owner of an Anheuser-Busch (A-B) wholesalership contracted with the plaintiffs to sell his wholesalership. See id. at 684. The sales contract between the owner and the plaintiffs was expressly conditioned on A-B’s approval. See id. Additionally, the equity agreement between A-B and the owner required A-B’s approval for any sale of the wholesalership. See id. A-B disapproved the sale to the plaintiffs. In affirming a grant of summary judgment to A-B, the Third District Court of Appeal reasoned, “Because plaintiffs’ agreement with [the owner] was specifically conditioned upon A-B’s approval, as a matter of law, A-B cannot be liable for tortious interference with their agreement.” Id. Moreover, in support of its holding, the court emphasized that A-B was not a disinterested third-party, as it had a contractual right in the equity agreement to disapprove any proposed transfer. See id.

All the material facts from Genet are present in this case. Just as the sales agreement in Genet was conditioned on A-B’s approval, the transfer and relocation agreement here was expressly conditioned on Appellee’s approval. Furthermore, just as the equity agreement in Genet gave A-B the power to disapprove a sale, the Dealership Agreement here gave Appellee the power to disapprove a transfer or relocation. Therefore, pursuant to Genet, the district court properly granted Appellee summary judgment on Appellants’ tortious interference claims. ^[9]

[*1295] IV. CONCLUSION

In this case based on Florida law, Appellants contend that, by disapproving the relocation and transfer of their dealership, Appellee breached a contract, violated Fla. Stat. § 320.643, and tortiously interfered with a contract. We conclude otherwise. The district court correctly granted Appel-lee summary judgment on all claims.

AFFIRMED.