Chair DikLine:
630 x 615 x H 880 mm
https://vladivostok.basicdecor.ru/product/stul-dikline-6827-t-seraya-velo-13-opory-chernye-00-00082490/ 

Without the Turbosmooth smoothing modifier:
Polys: 19 848
Verts: 19 975
With the Turbosmooth smoothing modifier iterations 2:
Polys: 635 456
Verts: 318 123

The Turbosmooth modifier with Isoline Display has been applied to the necessary objects;
An FBX file is available (if necessary, apply the Turn To Poly modifier to the FBX file);
For Corona render, it is recommended to use a version no lower than 1.5, as the glossiness of the materials is set taking into account PBR.