Jan 27 (Reuters) - Realia Business :
* Inversora Carso, investment vehicle of Mexican billionaire Carlos Slim, offered on Wednesday 0.8 euros ($0.9) per share for the shares in Spain's Realia Business it does not already own.
* The offer is at a 17.6 percent premium to Wednesday's closing price, according to a Reuters calculation. Carso already owns 30.5 percent of Realia Business.
* Carso is also the main shareholder of builder FCC which itself owns 36.9 percent of Realia Business.
* ($1 = 0.9195 euros) (Reporting By Sonya Dowsett; Editing by Andres Gonzalez)