XETRA (euro adhoc) -

  Notification concerning transactions by persons discharging managerial
  responsibilities pursuant to section 15a of the WpHG, transmitted by euro
  adhoc with the aim of a Europe-wide distribution. The issuer is responsible
  for the content of this announcement.

07.08.2007

Details of the person subject to the disclosure
requirement:

Name:              Dr. Lorenz Näger

Reason for the disclosure requirement:

Reason:            Person performing managerial responsibilities
Position:          Member of a managing body

Details of the transaction:
Description of financial instrument: Shares

ISIN:                DE0006047004
Type of transaction: purchase
Date:                07.08.2007
No of items:         385
Currency:            Euro
Price:               105.61000
Total amount traded: 40,659.85
Place:               XETRA
Explanation:

Issuer subject to the publication requirement:

end of announcement                               euro adhoc 08.08.2007 16:50:07

Further inquiry note:

Branche: Construction & Property
ISIN: DE0006047004
WKN: 604700
Index: HDAX, MDAX, Classic All Share, Midcap Market Index, Prime All
Share, CDAX
Börsen: Börse Frankfurt / official dealing/prime standard
Börse Berlin / free trade
Börse Hamburg / free trade
Börse Hannover / free trade
Börse Stuttgart / official dealing
Börse Düsseldorf / official dealing
Börse München / official dealing