nested routes

application.controller.js

import Ember from 'ember';

export default Ember.Controller.extend({
  appName:'Ember Twiddle',
  building: Ember.computed(function(){
    return {id: 1, name: "BUILDING!"}
  })
});

application.template.hbs

<h1>Welcome to {{appName}}</h1>
<br>
<br>

{{#link-to "buildings.show" building}}
  standalone building
{{/link-to}}

{{!--#link-to "contacts.buildings.show" building}}
  contacts building
{{/link-to--}}

{{#link-to "projects.buildings.show" building}}
  projects building
{{/link-to}}

{{outlet}}
<br>
<br>

buildings.show.template.hbs

{{model.name}}

router.js

import Ember from 'ember';
import config from './config/environment';

const Router = Ember.Router.extend({
  location: config.locationType
});

Router.map(function() {
  this.route("buildings", function(){
    this.route("show", {path: "/:building_id"});
  });
  
  this.route("contacts", function(){
    this.route("show", {path: ":/id"});
    this.route("buildings", {resetNamespace:true}, function(){
    	this.route("show", {path: "/:building_id"});
  	});
  });

  this.route("projects", function(){
    this.route("show", {path: ":/id"});
    this.route("buildings", {resetNamespace:true}, function(){
    	this.route("show", {path: "/:building_id"});
  	});
  });

});

export default Router;

twiddle.json

{
  "version": "0.4.17",
  "EmberENV": {
    "FEATURES": {}
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.2.0",
    "ember-data": "https://cdnjs.cloudflare.com/ajax/libs/ember-data.js/2.2.0/ember-data.js",
    "ember-template-compiler": "2.2.0"
  }
}