Total
Polys: 481,184

Fagus_sylvatica_sphere_001
Polys: 72,634
Size
X: 122 cm.
Y: 117 cm
Z: 68 cm.

Fagus_sylvatica_sphere_002
Polys: 93,250
Size
X: 152 cm.
Y: 150 cm.
Z: 95 cm.

Fagus_sylvatica_sphere_003
Polys: 121 694
Size
X: 152 cm.
Y: 152 cm
Z: 99 cm.

Fagus_sylvatica_sphere_004
Polys: 193,606
Size
X: 192 cm.
Y: 189 cm.
Z: 128 cm.

More topiary trees:

https://3dsky.org/3dmodels/show/puzyreplodnik_kalinolistnyi_zelenyi_2_kusta_physocarpus_opulifolius_sphere 
https://3dsky.org/3dmodels/show/grusha_forma_ekran_shpalera_pear_pleached 
https://3dsky.org/3dmodels/show/buk_evropeiskii_arka_fagus_sylvatica_arc 
https://3dsky.org/3dmodels/show/grab_obyknovennyi_tsilindr_carpinus_betulus_topiary_1 
https://3dsky.org/3dmodels/show/grab_obyknovennyi_forma_shar_carpinus_betulus_topiary_2 
https://3dsky.org/3dmodels/show/grab_obyknovennyi_forma_ekran_shpalera_carpinus_betulus_pleached_topiary_3 

In the archive:
3ds max 2012 Vray
3ds max 2012 Corona
Obj
V-ray mat
Corona mat
Textures

Have a nice use!