exhibit 10. 1 preliminary sales contract by and among : ( i ) ribera desarrollos s. a., tax identification ( cuit ) no. 30 - 70921182 - 6, with domicile at uruguay 772, piso 11°, of. 111, city of buenos aires, represented herein by its president, mr. luis carlos de narvaez steuer, identification ( dni ) no. 93667455, fabian oscar lusarreta, identification ( dni ) no. 18010453 - attorney - in - fact, ( hereinafter the “ seller ” ) ; ( ii ) inc s. a., with domicile at ayacucho 1055, piso 1º of the city of buenos aires, represented herein by mr. fabian oscar lusarreta, identification ( dni ) no. 18010453, acting in his capacity as attorney - in fact ( hereinafter, “ incsa ” ) ; ( iii ) sociedad anonima la nacion, with domicile at bouchard 557 of the city of buenos aires, represented herein by its undersigning attorneys - in - fact ( hereinafter, “ saln ” ) ; ( iv ) desarroladora urbana s. a., with domicile at leandro n. alem 790, piso 12º of the city of buenos aires, represented herein by its undersigning attorneys - in - fact ( hereinafter, “ dusa ”, and jointly with incsa and saln, the “ joint owners ” ), parties of the first part ; and, ( v ) mercadolibre srl, cuit 30 - 70308853 - 4, with domicile at arias 3751, 7° piso, city of buenos aires, represented herein by its undersigning attorneys - in - fact ( hereinafter, the “ purchaser ” ), party of the second part. the seller and the purchaser will be jointly referred to as the “ parties ” and individually as the “ party ” ; and whereas : 1. the seller is a joint owner of the real estate located in the district of vicente lopez, province of buenos aires, at avenida del libertador gral. san martin nº 77