dirk hoorelbeke
Omono
I would ID as a corkbark chinese elm (ulmus parvifolia nire) since leaves are chinese elm-size and form unlike zelkova serrata. I don't know the official name for sure. Here (Belgium and the Netherlands) they are sold as zelkova nire most of the time. In english better to search on corkbark elm or Niré.
Every tree with good ramification gets a little more labor intensive. It's an elm so shaded branches lose power and die. Besides trimming (2 to 6 times per year depending on development phase), cleaning the died branches and stumps and cleaning trunk there is no wiring involved in this stage. 3 to 5 hours per year maximum for maintenance maximum. Since i have trees that need several days or weeks to clean i consider this as a low maintenance / high performance tree. On the other hand, the more you need to work it, the more you enjoy your hobby.
Every tree with good ramification gets a little more labor intensive. It's an elm so shaded branches lose power and die. Besides trimming (2 to 6 times per year depending on development phase), cleaning the died branches and stumps and cleaning trunk there is no wiring involved in this stage. 3 to 5 hours per year maximum for maintenance maximum. Since i have trees that need several days or weeks to clean i consider this as a low maintenance / high performance tree. On the other hand, the more you need to work it, the more you enjoy your hobby.
I will try to find this tree. There is a mail order shop some hours away that has one Ulmus parvifolia cultivar called 'Hokkaido', but it says the trees are only 3-4" tall and grow about 1' per 25 years. Google image search appears to be a much smaller version of your tree - or maybe it simply needs to be trained into a more vertical growth pattern as it looks more like ground cover. 
