11The applicant submits that the condition relating to urgency must be regarded as satisfied if the suspension of operation of a contested decision would not preclude the decision from being fully effective if the main application were to be dismissed and if, conversely, immediate implementation of the contested decision would give rise to effects which would be difficult or impossible to reverse if the decision were to be annulled (see, in particular, the order of the President of the Court of Justice in Joined Cases 76/89 R, 77/89 R and 91/89 R RTE and Others v Commission [1989] ECR 1141, paragraph 12 et seq.).
12In the present case, if operation of the Decision ordering recovery of the aid from Fort Malakoff were not suspended, the Federal Republic of Germany would in all likelihood request the City of Mainz, through the Land, to recover immediately from Fort Malakoff the alleged State aid together with interest. It should not be required, contrary to its firm conviction and to the principle of pacta sunt servanda, to enforce in a national court a right to repayment of aid allegedly granted in breach of procedural rules before it has even been established that funds financed by State resources and classifiable as aid have in fact been granted.
13Furthermore, according to the applicant, it is probable that no German court would consider such an action against Fort Malakoff to be admissible, in the absence of any interest on the part of the applicant so long as it is not established that the Decision would be upheld. In any event, even if such an action were declared admissible, it is likely that the national court would decide, on its own initiative or upon application, to stay the proceedings until such time as the Court of First Instance has ruled on the legality of the Decision or to refer a question of interpretation to the Court of Justice for a preliminary ruling under Article 177 of the EC Treaty.
14The applicant also submits that immediate implementation of the Decision would allow Fort Malakoff to plead the total or partial nullity of the contract of sale in question and thereby attempt to escape certain long-term obligations stipulated in that contract and that this would create an irreversible situation. The applicant submits that its fears in this regard are well founded. The distribution and training centre for Siemens, which Fort Malakoff has undertaken to construct, has not yet been completed and its medium-and long-term profitability have become totally uncertain. Changes in the market situation have induced companies operating in the data-processing sector to abandon the idea of having their own training centres combined with distribution centres. In addition, the prices of offices which could be rented out for use by training organizations have been falling for several months in the Rhine-Main Region and are probably very much lower than the costs of having a centre providing services which belongs to a group. At the hearing, the applicant pointed out in this regard that, during discussions on 27 September 1996 between the City of Mainz, Fort Malakoff and Siemens, the latter stated, first, that it was not inclined to appeal against the Decision. Second, it expressed the opinion that the contract concluded with the City of Mainz was void in part or in its entirety as being in breach of Article 93(3) of the EC Treaty. Third, Siemens declared that it would be prepared to accept an increase in the disputed purchase price. The applicant concludes from all of these factors that Siemens will be seeking to avoid its long-term commitments, which, in view of developments in the market situation, have become disadvantageous for its group.
15In these circumstances, immediate implementation of the Decision would cause serious and irreparable damage to the City of Mainz, for which Siemens' use of the site in question until 2012 is of fundamental importance, both from the city-planning point of view and from economic and social perspectives. According to the applicant, the city would have very great difficulty in finding a new purchaser at the prices and on the conditions accepted by Siemens. On the other hand, suspension of implementation of the Decision would not, it claims, preclude the Decision's being fully effective, should it be upheld by the Court. The aid allegedly granted to Fort Malakoff is proportionately modest and represents at most 2% of that company's total investments in the execution of the project envisaged in the contract for sale in question. Recovery of the aid is therefore not jeopardized.
16The Commission rejects the applicant's arguments. It first points out that the applicant acknowledges that implementation of the Decision requires action on the part of the State concerned. No proceedings have yet been instituted. Moreover, and in any event, the applicant has the opportunity, by virtue of domestic legal remedies, to obtain protection — interim, if need be — against a national decision ordering recovery of the aid, in order to avoid the damage which it contends it will suffer.
17Likewise, the Commission claims that the applicant could protect itself against any attempts by Fort Malakoff to avoid its contractual obligations by having recourse to domestic legal remedies with a view to ensuring that the contractual obligations are complied with.
18In any event, termination of the contract would only have the effect of restoring the position before it was signed. It would then be open to the applicant to arrange a public sale of the site and obtain a better price for it. Even if it were to experience difficulties in finding a new purchaser or securing an equivalent price, its loss would be purely financial and would therefore be recoverable. The applicant has also failed to establish that a new sale, under such conditions, would jeopardize the city's finances. The views which it has expressed on the relatively small amount of aid alleged tend to confirm that neither it nor Fort Malakoff would be unduly affected by immediate recovery of the aid.
19According to well-established case-law, the urgency of the adoption of interim measures must be considered by examining whether the implementation of the contested measures, prior to the intervention of the decision of the Court on the main issue, is such as to give rise, for the party requesting the measures, to serious and irreparable damage which could not be put right if the contested decision were annulled or which, despite their interim nature, would be disproportionate to the defendant's interest in having the measures implemented, even when they are the subject of legal proceedings. It is for the applicant to prove that those conditions are satisfied (see, most recently, the order of the President of the Court of First Instance of 28 August 1996 in Case T-112/96 RSéché v Commission [1996] ECRSC II-1121, paragraph 16).
20In the present case, the applicant maintains that the risk of serious and irreparable damage which would allegedly arise if the Decision were to be implemented immediately stems from the obligation to institute legal proceedings against Fort Malakoff to recover the alleged State aid under which it could find itself and from a possible variation of the contractual terms, or even the annulment of the contract at Siemens' request, once the purchase price is changed pursuant to the Decision ordering recovery of the aid.
21With regard, first, to the risk that the applicant may be obliged to bring proceedings against its contracting party in order to recover the amount of alleged aid, it should be stressed at the outset that, according to the documents in the case and the observations of the parties, no steps or measures have so far been taken in that regard.
22Furthermore, even if the German Government were to institute proceedings in order for the applicant to recover the alleged aid, the party concerned does not specify what the exact nature of its loss would be. The fact alone that it may be obliged to resile a clause in the contract relating, in this case, to the purchase price, owing to its alleged irregularity, and to bring proceedings against Fort Malakoff in order to recover the amount of aid alleged would not, as it submits, be contrary to the principle of pacta sunt servanda but would simply be an application of the principle that the administrative authorities must act within the law.
23With regard, second, to the risk of serious and irreparable damage that might arise because of Fort Malakoff's and Siemens' alleged desire to extricate themselves from some of their long-term obligations by pleading that the contract in question is wholly or partially void on the ground that it breaches Articles 92 and 93 of the Treaty, the applicant has failed to adduce any evidence that those undertakings do in fact intend to avoid fulfilling their contractual obligations. In particular, it indicates no moves on their part to negotiate an amendment to the contract in order to take account of the increase in the purchase price resulting from the Decision. On the contrary, Siemens' statement, made during a meeting with the applicant on 27 September 1996, that it would be prepared to accept the price increase resulting from the Decision, as mentioned by the applicant at the hearing, rather suggests that it does not intend to renounce its long-term obligations. More generally, the documents before the Court and the parties' observations do not indicate any specific measure taken by Fort Malakoff or Siemens with a view to having the contract amended.
24Furthermore, even if it were accepted that Fort Malakoff is seeking to free itself from its contractual obligations, which has not been established, the applicant has not provided any specific explanation or put forward any convincing argument to show that, under German contract law, recovery of the alleged aid could undermine some of the essential terms of the contract, even though the amount to be repaid would, according to the applicant's own observations, amount at most to 2% of Fort Malakoff's total investment in the realization of the project in question. In the absence of more specific evidence, it would appear at first sight improbable that a relatively modest increase in the purchase price could justify a fundamental alteration of some of the essential contractual obligations assumed by Fort Malakoff, or even the annulment of the contract.
25The applicant has also failed to demonstrate that the domestic remedies available to it under German law allowing it, if necessary, to oppose an amendment to, or résiliation of, the contract, in whole or in part, by its contracting partner would not enable it to avoid serious and irreparable damage, assuming that it can show that such damage is likely (see the orders of the President of the Court of Justice in Case 310/85 R Deufil v Commission [1986] ECR 537, paragraph 22, Case 142/87 R Belgium v Commission [1987] ECR 2589, paragraph 26, and in Case 303/88 R Italy v Commission [1989] ECR 801 (summary publication)).
26From that perspective, it must be stressed that the German courts alone are competent to determine whether, in light of the relevant provisions of German law, the alteration of the purchase price pursuant to the Decision ordering recovery of the alleged aid can, in the circumstances of this case, justify the contract being set aside in full or in part. In that context, the best solution is to consider, if appropriate, whether it is necessary to adopt interim measures in order to safeguard the applicant's rights pending the outcome of the main proceedings before the Court.
27Furthermore, and in any event, suspension of operation of the Decision would, in the context of the present proceedings, merely have the effect of precluding, during the main proceedings, any action by the German public authorities to recover the alleged aid. It would not necessarily and automatically preclude an action on the part of Fort Malakoff to have the contract declared void or amended on the ground that it involves unlawful aid granted in breach of Article 93(3) of the Treaty, the direct effect of which has been confirmed by the Court of Justice. In such an eventuality, it would be for any national court before which the matter might be brought to determine whether it would be appropriate to stay proceedings or adopt other interim measures, in accordance with its internal rules of procedure, pending, the Court's decision in the main proceedings (see paragraph 26 above).
28Finally, even supposing that immediate implementation of the Decision could result in irreversible annulment of the contract, which is a possibility which has not been established, the applicant has failed to show that it would be in a difficult economic and financial position and that it would be unable to dispose of the site in question, situated in the city centre, to one or more purchasers on terms that would be equally favourable from the financial point of view as well as from the city-planning and economic and social points of view.
29It follows from all of the foregoing that the applicant has failed to adduce any convincing arguments to support the contention that immediate implementation of the Decision is likely to cause it damage that would be difficult to make good.
30It follows that the condition regarding the existence of the risk of damage if interim measures are not granted immediately has not been satisfied. The present application for interim measures must therefore be dismissed, without its being necessary to examine the objection of inadmissibility raised by the Commission or the pleas and arguments relied on by the applicant to justify, on the substance, the grant of the interim measure sought.