public class Building
    {

        [System.ComponentModel.DataAnnotations.Key]
        public int Id { get; set; }
        public string Info { get; set; }
        public string ObjectName { get; set; }
        public string BuilderName { get; set; }
        [NotMapped]
        public bool Check { get; set; }
        public List<CompanyBuilding> BuildingCompanys { get; set; }
       
    }

    public class CompanyBuilding
    {
        public Guid CompanyId { get; set; }
        public int BuildingId { get; set; }
        public Building Building { get; set; }
     }

Context.WebBuildings.Include(x => x.BuildingCompanys.Where(e => e.CompanyId == id)).AsNoTracking().ToList()

SELECT        w.Id, w.BuilderName, w.Info, w.ObjectId, w.ObjectName, t0.BuildingID, t0.CompanyID
FROM            WebBuildings AS w LEFT OUTER JOIN
                             (SELECT        BuildingID, CompanyID
                               FROM            tblOutCompanyBuildings AS t
                               WHERE        (CompanyID = '227F15D8-574F-46C4-7A51-08D909E053F9')) AS t0 ON w.Id = t0.BuildingID
ORDER BY w.Id, t0.BuildingID, t0.CompanyID

SELECT        w.Id, w.BuilderName, w.Info, w.ObjectId, w.ObjectName, t0.BuildingID, t0.CompanyID
FROM            WebBuildings AS w LEFT OUTER JOIN
                             (SELECT        BuildingID, CompanyID
                               FROM            tblOutCompanyBuildings AS t
                               WHERE        (CompanyID = '227F15D8-574F-46C4-7A51-08D909E053F9')) AS t0 ON w.Id = t0.BuildingID
WHERE        (t0.BuildingID IS NULL)
ORDER BY w.Id, t0.BuildingID, t0.CompanyID

Context.WebBuildings.Include(x => x.BuildingCompanys.Where(e => e.CompanyId == id)).Where(x => x.BuildingCompanys == null).AsNoTracking().ToList()

exec sp_executesql N'SELECT [w].[Id], [w].[BuilderName], [w].[Info], [w].[ObjectName], [t0].[BuildingId], [t0].[CompanyId]
FROM [WebBuildings] AS [w]
LEFT JOIN (
    SELECT [t].[BuildingId], [t].[CompanyId]
    FROM [tblOutCompanyBuildings] AS [t]
    WHERE [t].[CompanyId] = @__id_0
) AS [t0] ON [w].[Id] = [t0].[BuildingId]
WHERE 0 = 1
ORDER BY [w].[Id], [t0].[BuildingId], [t0].[CompanyId]',N'@__id_0 uniqueidentifier',@__id_0='227F15D8-574F-46C4-7A51-08D909E053F9'

    public class CompanyBuilding
    {
        public Guid? CompanyId { get; set; }
        public int BuildingId { get; set; }
        public Building Building { get; set; }
    }

    public class ApplicationContext : DbContext
    {
            public DbSet<Building> WebBuildings{ get; set; }
            public DbSet<CompanyBuilding> tblOutCompanyBuildings { get; set; }
            public ApplicationContext(DbContextOptions<ApplicationContext> options): base(options)
            {
                Database.EnsureCreated();
            }
            protected override void OnModelCreating(ModelBuilder modelBuilder)
            {
                modelBuilder.Entity<CompanyBuilding>().HasKey(k => new { k.BuildingId, k.CompanyId });
            }
    }

    public IActionResult OnGet(Guid? id)
    {
            if (id == null)
            {
                return NotFound();
            }

            Buildings = Context.WebBuildings.Include(x => x.BuildingCompanys.Where(e => e.CompanyId == id)).Where(x => x.BuildingCompanys.Any(b => b.CompanyId == null)).AsNoTracking().ToList();

            return Page();
   }

SELECT        w.Id, w.BuilderName, w.Info, w.ObjectId, w.ObjectName, t0.BuildingID, t0.CompanyID
FROM            WebBuildings AS w LEFT OUTER JOIN
                             (SELECT        BuildingID, CompanyID
                               FROM            tblOutCompanyBuildings AS t
                               WHERE        (CompanyID = '227F15D8-574F-46C4-7A51-08D909E053F9')) AS t0 ON w.Id = t0.BuildingID
WHERE        (t0.BuildingID IS NULL)
ORDER BY w.Id, t0.BuildingID, t0.CompanyID

Buildings = Context.WebBuildings.Where(b => !Context.tblOutCompanyBuildings.Where(cb => cb.BuildingId == b.Id && cb.CompanyId == id).Any()).AsNoTracking().ToList();