*800The Forest Preserve District of Cook County, Illinois, has been trying to acquire a 400-acre estate in Barrington after the owners defaulted on a mortgage and note held by the Forest Preserve. The Forest Preserve foreclosed and then bought the property at the foreclosure auction. The original owners have expressed their opposition by filing five lawsuits of their own, in addition to raising affirmative defenses and counterclaims in the still-pending foreclosure action. This appeal arises in the owners' third federal lawsuit, in which they have alleged unconstitutional takings, fraud, and derivative claims for conspiracy and aiding and abetting. The district court dismissed the suit for failure to state a claim. We affirm.
I. Factual and Procedural Background
A. Underlying Transactions
In 2006, plaintiffs Meryl Squires-Cannon and Richard Kirk Cannon purchased a 400-acre estate and horse farm in Barrington. The Cannons bought the property through two wholly-owned limited liability companies, Royalty Properties, LLC and Cannon Squires Properties, LLC, which are also plaintiffs in this lawsuit. The LLCs executed a one-year, $14.5 million note and mortgage loan agreement with Amcore Bank, N.A. The Cannons allege that Amcore committed to modify the loan to a longer term before the end of the initial one-year term. But the financial crisis intervened, and Amcore reneged. Under financial distress itself, Amcore called the loan and when, we assume, the Cannons were unable to refinance in the financial environment of the time, Amcore filed for foreclosure in an Illinois state court. Amcore then failed in 2009, and the FDIC became its receiver. BMO Harris Bank, N.A. bought Amcore's loan assets at a discount from the FDIC, became the owner of the Cannons' note, and took over as the plaintiff in the foreclosure action.
When the value of the estate fell in the midst of the financial crisis, BMO faced a risk that the note was worth more than the property securing it. And the FDIC had agreed to pay BMO 80% of any Amcore loan that BMO could not recover directly from the borrowers. To cut their losses on the Cannons' loan, the FDIC and BMO had incentives to find a buyer for the note. Enter the Forest Preserve. The Cannons allege that the FDIC, BMO, Bayview Loan Servicing, LLC, and Does 1-15 secretly agreed to assign the note to the Forest Preserve for $14 million. After the Forest Preserve's board approved the purchase, BMO assigned the note to the Forest Preserve, which became the plaintiff in the foreclosure action.
*801In 2013, the foreclosure court granted summary judgment for the Forest Preserve. The Forest Preserve then obtained board approval to offer a credit bid for the estate at the foreclosure sale. The Forest Preserve made the (winning) credit bid of about $14.5 million at the foreclosure sale. The foreclosure court also entered a deficiency judgment against the Cannons for over $6 million. See BMO Harris Bank, N.A. v. Royalty Properties, LLC , No. 1-15-1338, 2016 WL 6269967, at *3 (Ill. App. May 17, 2016). The Illinois Appellate Court later reversed the foreclosure judgments. Id. at *14. On remand, the foreclosure court reinstated its order making the Forest Preserve a mortgagee in possession, but the Illinois Appellate Court also vacated that order in an interlocutory appeal. Forest Preserve District of Cook County v. Royalty Properties, LLC , No. 1-17-1564, 2017 WL 3758758 (Ill. App. Aug. 29, 2017). As far as we know, there is at this time no judgment in the foreclosure action. The Cannons told us at oral argument that the foreclosure action is "starting from scratch."1
B. Lawsuits
There have now been six separate lawsuits relating to the Cannons' default on the note-three state and three federal. The three state lawsuits are:
(1) the foreclosure action, which is still pending;
(2) the Cannons' lawsuit against the Forest Preserve and BMO (the "taxpayer action"), which was dismissed, Baker v. Forest Preserve District , 393 Ill.Dec. 1, 33 N.E.3d 745 (Ill. App. 2015) (affirming dismissal of all claims and rejecting theory that Forest Preserve's purchase of note and participation in foreclosure auction violated Cook County Forest Preserve District Act), and;
(3) a lawsuit by one of the Cannon entities against the Forest Preserve for breach of a purported lease after the foreclosure sale, which is stayed, Royalty Farms, LLC v. Forest Preserve District of Cook County , 419 Ill.Dec. 234, 92 N.E.3d 943 (Ill. App. 2017) (reversing order awarding possession of property to Forest Preserve and remanding and staying eviction proceedings pending resolution of foreclosure action).
The three federal lawsuits are:
(1) a lawsuit with allegations similar to this one, which was dismissed for lack of jurisdiction, Squires Cannon v. Forest Preserve District of Cook County , No. 13 C 6589, 2014 WL 1758475 (N.D. Ill. May 2, 2014) ;
(2) a lawsuit by Meryl Squires-Cannon against several Forest Preserve officials and employees for false arrest and malicious prosecution, which was dismissed on the merits, Squires-Cannon v. White , 864 F.3d 515 (7th Cir. 2017) (affirming dismissal), and;
*802(3) the lawsuit in this appeal, which the district court dismissed, Squires Cannon v. Forest Preserve District of Cook County , No. 14 C 5611, 2016 WL 2620515 (N.D. Ill. May 9, 2016).
II. Analysis
Our review of a dismissal under Rule 12(b)(6) for failure to state a claim is de novo , and we may affirm on any ground in the record. Brooks v. Ross , 578 F.3d 574, 578 (7th Cir. 2009), citing Tamayo v. Blagojevich , 526 F.3d 1074, 1081 (7th Cir. 2008), and citing Bennett v. Spear , 520 U.S. 154, 166, 117 S.Ct. 1154, 137 L.Ed.2d 281 (1997). We accept the complaint's well-pleaded facts as true and draw all reasonable inferences from those allegations in the Cannons' favor. Abcarian v. McDonald , 617 F.3d 931, 933 (7th Cir. 2010), citing London v. RBS Citizens, N.A. , 600 F.3d 742, 745 (7th Cir. 2010). But written exhibits attached to the complaint may trump contradictory allegations. Id. , citing Northern Indiana Gun & Outdoor Shows, Inc. v. City of South Bend , 163 F.3d 449, 455 (7th Cir. 1998).
A. Takings Claims
The takings clause of the Fifth Amendment provides, "nor shall private property be taken for public use, without just compensation." U.S. Const. amend. V. The Fourteenth Amendment makes the takings clause applicable to the States and their subdivisions. See, e.g., Murr v. Wisconsin , --- U.S. ----, 137 S.Ct. 1933, 1942, 198 L.Ed.2d 497 (2017), citing Chicago, Burlington & Quincy R.R. Co. v. Chicago , 166 U.S. 226, 17 S.Ct. 581, 41 L.Ed. 979 (1897) ; cf. Dolan v. City of Tigard , 512 U.S. 374, 405-06, 114 S.Ct. 2309, 129 L.Ed.2d 304 (1994) (Stevens, J., dissenting) (criticizing citation of Chicago, Burlington & Quincy Railroad Co. as resurrecting substantive due process analysis identified with Lochner v. New York , 198 U.S. 45, 25 S.Ct. 539, 49 L.Ed. 937 (1905) ). The Cannons allege that the Forest Preserve violated the takings clause here in three ways: (1) by passing an ordinance converting the estate into a forest preserve; (2) by buying the mortgage from BMO and then taking over as the plaintiff in the foreclosure action; and (3) by physically entering the estate and installing Forest Preserve signs at the estate entrances. All three theories fail, and the derivative conspiracy and aiding-and-abetting claims fall with them.
1. No Taking by Ordinance
After the Forest Preserve acquired the note from BMO, it passed an ordinance creating a forest preserve district for "lands now owned and lands to be acquired." The "lands" included the Cannon estate, and the ordinance stated that the Forest Preserve "shall acquire" those "lands." The ordinance also authorized the Forest Preserve to bid at the foreclosure auction and set a ceiling for the bid. Enactment of the ordinance was not a regulatory taking, and the district court properly rejected this theory.
A regulatory taking is "a restriction on the use of property that [goes] 'too far.' " Horne v. Department of Agriculture , --- U.S. ----, 135 S.Ct. 2419, 2427, 192 L.Ed.2d 388 (2015), quoting Pennsylvania Coal Co. v. Mahon , 260 U.S. 393, 415, 43 S.Ct. 158, 67 L.Ed. 322 (1922). To determine how far is too far, we consider factors that include "the economic impact of the regulation, its interference with reasonable investment-backed expectations, and the character of the government action." Id. , citing Penn Central Transportation Co. v. New York City , 438 U.S. 104, 124, 98 S.Ct. 2646, 57 L.Ed.2d 631 (1978).
The character of this government action defeats the Cannons' claim. The ordinance prospectively authorized the Forest Preserve to acquire the estate. The *803ordinance did not effect the actual acquisition of the estate. And the estate became a part of the Forest Preserve only after the Forest Preserve bought it at the foreclosure sale, not before. (Recall, though, that the foreclosure sale has since been set aside by the state courts.)
The Cannons argue that the ordinance was not prospective because it also authorized condemnation. But the "mere enactment of legislation which authorizes condemnation of property cannot be a taking." Danforth v. United States , 308 U.S. 271, 286, 60 S.Ct. 231, 84 L.Ed. 240 (1939) (addressing property owner's claim under the Flood Control Act of 1928). The same principle applies to the ordinance designating the estate as a future forest preserve.2 One reason for that principle is linked to the economic impact factor. Even if the ordinance reduced the estate's value before the foreclosure sale, that reduction is not a taking because any "impairment of the market value" of the estate would be "incident to otherwise legitimate government action." Kirby Forest Industries, Inc. v. United States , 467 U.S. 1, 15, 104 S.Ct. 2187, 81 L.Ed.2d 1 (1984) (initiation of condemnation proceedings was not a taking); see also Danforth , 308 U.S. at 285, 60 S.Ct. 231 ("A reduction or increase in the value of property may occur by reason of legislation for or the beginning or completion of a project. Such changes in value are incidents of ownership. They cannot be considered as a 'taking' in the constitutional sense."). In addition, of course, there is the practical consideration. If merely authorizing condemnation amounted to a taking, government projects requiring condemnation and compensation would become unmanageable.
2. No Taking via Foreclosure or Physical Entry
The district court properly rejected the Cannons' theory that the Forest Preserve took the property by buying the note, foreclosing on it, and then buying the estate at the foreclosure sale. By foreclosing on the note, the Forest Preserve exercised its contractual right, not a governmental prerogative. See Warren v. Government Nat'l Mortgage Ass'n , 611 F.2d 1229, 1234 (8th Cir. 1980) ("As a party to the contract, and even though it was a governmentally-owned and authorized entity, GNMA had a right to resort to its contractual remedies just as a purely private entity had."), citing Atlantic Mutual Ins. Co. v. Cooney , 303 F.2d 253, 259 (9th Cir. 1962), and Rex Trailer Co. v. UnitedStates , 350 U.S. 148, 151, 76 S.Ct. 219, 100 L.Ed. 149 (1956). The Forest Preserve acted "in its proprietary rather than its sovereign capacity." St. Christopher Associates, L.P. v. United States , 511 F.3d 1376, 1385 (Fed. Cir. 2008) (no taking where HUD entered into regulatory agreement with property owner and refused to consider owner's rent increase request), citing Hughes Communications Galaxy, Inc. v. United States , 271 F.3d 1060, 1070 (Fed. Cir. 2001) ; see also Southern Comfort Campgrounds v. Federal Home Loan Bank Bd. , No. 89-4417, 1995 WL 63090, at *2 (E.D. La. Feb. 14, 1995) (no taking where FDIC, as receiver for original lender, foreclosed and bought *804property because "a taking only results from the government's exercise of its sovereign power to appropriate private property for public use"), citing DSI Corp v. United States , 655 F.2d 1072 (Ct. Cl. 1981). By foreclosing on the note, the Forest Preserve acted like any other creditor with a security interest. See Klump v. United States , 50 Fed.Cl. 268, 271 (2001) ("when the government simply asserts its ultimate right to ownership of an interest in property through the same legal channels that any other individual would employ to assert such an interest, no taking under the Fifth Amendment occurs").3
The Cannons attempt to distinguish these proprietary-function cases by arguing that they contracted with a private party, not a government entity. Nevertheless, the note they signed to obtain more than $14 million gave the lender the right to assign the note to anyone else at any time without notice to or consent from the Cannons. Buying the estate at the foreclosure auction was also not a taking. See, e.g., Oglethorpe Co. v. United States , 558 F.2d 590, 596 (Ct. Cl. 1977) (rejecting takings claim where plaintiff entered FHA-insured mortgages with Prudential, which assigned deeds to HUD, which then foreclosed and bought property from itself at foreclosure auction).
The Cannons' physical takings theory also fails because the Forest Preserve was acting as a creditor. If the Forest Preserve prematurely took possession of the estate, patrolled the property, or put up signs at estate entrances without being a mortgagee in possession, the Cannons may have state-law remedies for those claims, but we do not see any constitutional violations in these allegations that are tied so closely to the state-court foreclosure action.4
*805The Cannons' claims against all other defendants for conspiracy and aiding and abetting a taking also fail. Without an underlying constitutional violation, there is no derivative liability. Champion Parts, Inc. v. Oppenheimer & Co. , 878 F.2d 1003, 1008 (7th Cir. 1989) (affirming dismissal of Illinois conspiracy claim because plaintiff failed to allege underlying tort).
B. Fraud Claims
The Cannons also allege claims for fraudulent misrepresentation and fraudulent concealment: one against the Forest Preserve and its lawyer, Francis Keldermans, and another against the Forest Preserve and a neighbor, Robert McGinley, and McGinley Partners, LLC. For the claim against Keldermans and the Forest Preserve, the Cannons also add conspiracy and aiding-and-abetting claims against all defendants except the United States. Although the claims differ based on the allegedly fraudulent misrepresentations and concealments, both fraud claims fail for the same reasons: no damages and no duty.
A common-law fraud claim in Illinois requires five elements: "(1) a false statement of material fact; (2) defendant's knowledge that the statement was false; (3) defendant's intent that the statement induce the plaintiff to act; (4) plaintiff's reliance upon the truth of the statement; and (5) plaintiff's damages resulting from reliance on the statement." Connick v. Suzuki Motor Co. , 174 Ill.2d 482, 221 Ill.Dec. 389, 675 N.E.2d 584, 591 (1996), citing Board of Education of City of Chicago v. A, C & S, Inc. , 131 Ill.2d 428, 137 Ill.Dec. 635, 546 N.E.2d 580, 591 (1989).
Illinois also recognizes the common-law tort of fraudulent concealment, which requires a plaintiff to "allege that the defendant concealed a material fact when he was under a duty to disclose that fact to plaintiff." Id. , 221 Ill.Dec. 389, 675 N.E.2d at 593, citing Lidecker v. Kendall College , 194 Ill.App.3d 309, 141 Ill.Dec. 75, 550 N.E.2d 1121, 1124 (1990). The duty to disclose arises only in certain situations, including where the "plaintiff and defendant are in a fiduciary or confidential relationship" and "where plaintiff places trust and confidence in defendant, thereby placing defendant in a position of influence and superiority over plaintiff." Id. , citing Kurti v. Fox Valley Radiologists, Ltd. , 124 Ill.App.3d 933, 80 Ill.Dec. 236, 464 N.E.2d 1219, 1223 (1984). Rule 9(b)'s heightened pleading standard requires plaintiffs to allege fraud with "particularity." Fed. R. Civ. P. 9(b) ; see also Wigod v. Wells Fargo Bank, N.A. , 673 F.3d 547, 569 (7th Cir. 2012), quoting Borsellino v. Goldman Sachs Group, Inc. , 477 F.3d 502, 507 (7th Cir. 2007). Rule 9(b) 's particular requirement also applies to fraudulent concealment claims. Wigod , 673 F.3d at 571.
*806The Cannons allege that attorney Keldermans, on behalf of the Forest Preserve, attempted to negotiate with them for an agreement for a deed in lieu of foreclosure. Before that negotiation began, Keldermans asked the Cannons to sign a "Pre-Negotiation and Confidentiality Agreement." That confidentiality agreement identified the purchaser as "Horizon Farms Loan Acquisition LLC, an Illinois limited liability company to be formed." Keldermans also allegedly told the Cannons that the purchaser was "not just one individual." The Cannons allege that these statements were fraudulent because the real purchaser was to be the Forest Preserve, and they claim that Keldermans fraudulently concealed that fact. The Cannons allege that they relied on these statements by signing the confidentiality agreement, divulging confidential information to Keldermans, and refraining from learning that the Forest Preserve was the purchaser in time to oppose the Forest Preserve's approval of the note purchase. The Cannons claim that they were damaged because, once the Forest Preserve had the option to buy the note, BMO could not negotiate a resolution with them-even though the Cannons offered the same amount for the note that the Forest Preserve had.
The allegations against McGinley and McGinley Partners are similar. McGinley met with the Cannons and told them that a "group of neighbors" was interested in buying the estate if the Cannons would assign title to them. The Cannons allege that McGinley concealed from them the fact that he was acting on behalf of the Forest Preserve. The Cannons relied, they say, by disclosing their willingness to negotiate, and they claim they were damaged because they could have opposed the Forest Preserve's efforts and successfully negotiated with BMO.
Even if these statements were fraudulent, the Cannons fail to allege any plausible damage. We agree with the district court: the Cannons inflicted their own damage by defaulting on the note. BMO could assign the note without any apparent restrictions. Squires-Cannon , 2016 WL 2620515, at *7. The damage theory of both fraud claims is that the Cannons could not negotiate a resolution with BMO. But BMO's inability to negotiate did not arise from Keldermans' or McGinley's alleged fraud. The Forest Preserve signed the agreement to buy the note from BMO on February 4, 2013-before the Cannons' meeting with Keldermans on February 14, 2013, and before their meeting with McGinley on March 11, 2013.
The fraudulent concealment claims also fail because Keldermans and McGinley had no duty to disclose to the Cannons the Forest Preserve's involvement in the deals they were trying to negotiate. The Cannons do not allege a fiduciary or confidential relationship. And their allegations do not indicate a special trust relationship because "the standard for identifying a special trust relationship is extremely similar to that of a fiduciary relationship." Toulon v. Continental Casualty Co. , 877 F.3d 725, 738 (7th Cir. 2017), quoting Wigod , 673 F.3d at 571. "[A]symmetric information alone does not show the degree of dominance needed to establish a special trust relationship." Wigod , 673 F.3d at 573, citing Miller v. William Chevrolet/GEO, Inc. , 326 Ill.App.3d 642, 260 Ill.Dec. 735, 762 N.E.2d 1, 13-14 (2001).
Without an underlying tort, the derivative claims for conspiracy and aiding and abetting fail. Champion Parts, Inc. v. Oppenheimer & Co. , 878 F.2d 1003, 1008 (7th Cir. 1989) (affirming dismissal of Illinois conspiracy claim because plaintiff failed to allege underlying tort); Hefferman v. Bass , 467 F.3d 596, 601-02 (7th Cir. 2006) (reversing *807dismissal of Illinois aiding and abetting claim but noting that aiding and abetting claims require allegation of a "wrongful act" by "the party whom the defendant aids"), citing Thornwood, Inc. v. Jenner & Block , 344 Ill.App.3d 15, 278 Ill.Dec. 891, 799 N.E.2d 756, 767 (2003).
The district court correctly granted the defendants' motion to dismiss, and its judgment is
AFFIRMED.