PetFusion Ultimate Cat Climbing Tower & Activity Tree.  24 x 20.8 x 76.8 inches (lwh) Tall.  4 Sisal Scratching Posts.  Modern Wall Mounted Cat Furniture.  Espresso Finish.   

MY CAT LOVED IT!!   You can use it at full height with all 4 sisal posts.  When my cat got older, I lowered the tower using only 2 sisal posts.  You can use 1, 2, 3, or 4 posts to vary the height.  See photos.    It was easy to set up.  Very sturdy and firm against the wall. 

From the manufacturer: 

About this item

  • INTERACTIVE DESIGN TO IMPROVE YOUR CAT'S WELLNESS: (I) For cats who love to climb & perch up high. (II) Great stimulation for young kittens & older cats. No age discrimination. (III) Stretch, scratch, jump, climb, perch, lounge & play
  • MODERN CAT FURNITURE: (I) Compared to the over-engineered cat trees which clutter your living space and actually limit your cat from climbing. That's what some cats believe curtains are now for : )
  • SAFETY FIRST EASY WALL MOUNTED ASSEMBLY: (I) Securely attaches to the wall providing a safe environment for your children and cat(s). (II) Includes zinc drywall anchors that can be attached to your wall with a hammer & screwdriver and also easily removed with just a screwdriver. No drilling required unless you prefer to anchor into studs or have plaster walls. (III) Estimate 15-20-minute total assembly time
  • PEACE OF MIND: (I) Premium E0 grade MDF passes formaldehyde safety regulations. (II) Product also passes stricter European REACH standards
  • (I) 24 x 20. 8 x 76. 8 inches (lwh). (II) Replacement posts available from the manufacturer. 

Customer ratings by feature

Sturdiness
4.5  4.5
Stability
4.4  4.4
Easy to assemble
4.4  4.4
Value for money
4.3  4.3