Similar to LXC, LXD 2.x can also assign static IP addresses. Almost similar approach but the files are slightly different.
Also note as of LXD 2.3 there are networking tools that take care of this.
modify /etc/default/lxd-bridge to reference an external dnsmasq.conf
put in snippet here
change the default range,
put in snippet here
Reference
http://jason.trickett.us/2016/08/lxd-containers-static-ip-addresses-heres/ - Source article for this but missing some details on changing the default range otherwise you'll end up with collisions.