public class CardIndex
    {
        public int ID { get; set; }
        ...
        public Street Street { get; set; }
        public Street StreetObject { get; set; }
    }
public class Street
    {
        public int ID { get; set; }
        ...
        public virtual ICollection<CardIndex> Cards { get; set; }
    }

public class Street
    {
        public int ID { get; set; }
        ...
        public virtual ICollection<CardIndex> CardsStreet { get; set; }
        public virtual ICollection<CardIndex> CardsStreetObject { get; set; }
    }

protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Entity<CardIndex>().HasRequired(p => p.Street)
                .WithMany(b => b.Cards)
                .HasForeignKey(p => p.StreetId).WillCascadeOnDelete(false);

            modelBuilder.Entity<CardIndex>().HasRequired(p => p.StreetObject)
                .WithMany(b => b.CardsObject)
                .HasForeignKey(p => p.StreetObjectId).WillCascadeOnDelete(false);  
        }