diff --git a/projects/admin.py b/projects/admin.py
index 703d11d..be22c8a 100644
--- a/projects/admin.py
+++ b/projects/admin.py
@@ -1,5 +1,6 @@
 from django import forms
 from django.contrib import admin
+from mptt.admin import MPTTModelAdmin
 
 from .models import (
     Answer,
@@ -18,6 +19,10 @@ from .models import (
 )
 
 
+class BuildingClassficationAdmin(MPTTModelAdmin):
+    readonly_fields = ('pk', 'lft', 'rght', 'tree_id', 'level')
+
+
 class ProjectAdminForm(forms.ModelForm):
     files = forms.ModelMultipleChoiceField(queryset=ProjectFile.objects.none(), required=False)
     
@@ -44,7 +49,7 @@ class StageAdmin(admin.ModelAdmin):
 
 admin.site.register(Answer)
 admin.site.register(Arbitration)
-admin.site.register(BuildingClassfication)
+admin.site.register(BuildingClassfication,BuildingClassficationAdmin)
 admin.site.register(Candidate)
 admin.site.register(ConstructionType)
 admin.site.register(Order, OrderAdmin)
diff --git a/projects/forms.py b/projects/forms.py
index 43f77c5..3324403 100644
--- a/projects/forms.py
+++ b/projects/forms.py
@@ -6,7 +6,11 @@ from pprint import pprint, pformat
 import itertools
 import pydash as _; _.map = _.map_; _.filter = _.filter_
 
-from .models import Project, ProjectFile, Portfolio, Answer, AnswerMessage, Realty, PortfolioPhoto, Stage, ProjectWorkTypeSuggestion
+from .models import (
+    Project, ProjectFile, Portfolio, Answer,
+    AnswerMessage, Realty, PortfolioPhoto, Stage,
+    ProjectWorkTypeSuggestion, BuildingClassfication
+)
 from archilance import util
 from common.models import Location, LiveImageUpload
 from specializations.models import Specialization
@@ -145,6 +149,9 @@ class CustomerProjectEditForm(forms.ModelForm):
 
 
 class RealtyForm(forms.ModelForm):
+    building_classification = TreeNodeChoiceField(BuildingClassfication.objects.all(),
+                                                  widget=forms.Select(attrs={'class': 'selectpicker'}))
+
     class Meta:
         model = Realty
         
@@ -157,7 +164,6 @@ class RealtyForm(forms.ModelForm):
         
         widgets = {
             'construction_type': forms.Select(attrs={'class': 'selectpicker'}),
-            'building_classification': forms.Select(attrs={'class': 'selectpicker'}),
         }
     
     def __init__(self, *args, **kwargs):
@@ -168,10 +174,15 @@ class RealtyForm(forms.ModelForm):
             self.fields['name'].required = False
         
         self.fields['location'].queryset = Location.objects.root_nodes()[0].get_descendants()
+        self.fields['building_classification'].queryset = BuildingClassfication.objects.root_nodes()[0].get_descendants()
         # self.fields['location'].queryset = Location.objects # Migrate with this enabled
 
 
 class PortfolioForm(forms.ModelForm):
+    building_classification = TreeNodeChoiceField(
+        BuildingClassfication.objects.exclude(name='_root'),
+        widget=forms.Select(attrs={'class': 'selectpicker'}),
+    )
     duplicate = forms.BooleanField(required=False, label='Some label here')
     images_ids = forms.CharField(required=True)
 
@@ -180,7 +191,6 @@ class PortfolioForm(forms.ModelForm):
         fields = '__all__'
         
         widgets = {
-            'building_classification': forms.Select(attrs={'class': 'selectpicker'}),
             'construction_type': forms.Select(attrs={'class': 'selectpicker'}),
             'currency': forms.Select(attrs={'class': 'selectpicker'}),
             'term_type': forms.Select(attrs={'class': 'selectpicker'}),
@@ -201,6 +211,11 @@ class PortfolioEditForm(forms.ModelForm):
         widget=forms.CheckboxSelectMultiple,
         required=False,
     )
+
+    building_classification = TreeNodeChoiceField(
+        BuildingClassfication.objects.exclude(name='_root'),
+        widget=forms.Select(attrs={'class': 'selectpicker'}),
+    )
     
     class Meta:
         model = Portfolio
@@ -222,7 +237,6 @@ class PortfolioEditForm(forms.ModelForm):
         
         widgets = {
             'construction_type': forms.Select(attrs={'class': 'selectpicker'}),
-            'building_classification': forms.Select(attrs={'class': 'selectpicker'}),
             'currency': forms.Select(attrs={'class': 'selectpicker'}),
             'term_type': forms.Select(attrs={'class': 'selectpicker'}),
             'work_type': forms.Select(attrs={'class': 'selectpicker -project-work-type-select-field'}),
diff --git a/projects/migrations/0043_auto_20160921_2324.py b/projects/migrations/0043_auto_20160921_2324.py
new file mode 100644
index 0000000..a547a15
--- /dev/null
+++ b/projects/migrations/0043_auto_20160921_2324.py
@@ -0,0 +1,53 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.7 on 2016-09-21 20:24
+from __future__ import unicode_literals
+
+from django.db import migrations, models
+import django.db.models.deletion
+import django.db.models.manager
+import mptt.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('projects', '0042_portfolio_work_type'),
+    ]
+
+    operations = [
+        migrations.AlterModelManagers(
+            name='buildingclassfication',
+            managers=[
+                ('_default_manager', django.db.models.manager.Manager()),
+            ],
+        ),
+        migrations.AddField(
+            model_name='buildingclassfication',
+            name='level',
+            field=models.PositiveIntegerField(db_index=True, default=0, editable=False),
+            preserve_default=False,
+        ),
+        migrations.AddField(
+            model_name='buildingclassfication',
+            name='lft',
+            field=models.PositiveIntegerField(db_index=True, default=0, editable=False),
+            preserve_default=False,
+        ),
+        migrations.AddField(
+            model_name='buildingclassfication',
+            name='parent',
+            field=mptt.fields.TreeForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='children', to='projects.BuildingClassfication'),
+        ),
+        migrations.AddField(
+            model_name='buildingclassfication',
+            name='rght',
+            field=models.PositiveIntegerField(db_index=True, default=0, editable=False),
+            preserve_default=False,
+        ),
+        migrations.AddField(
+            model_name='buildingclassfication',
+            name='tree_id',
+            field=models.PositiveIntegerField(db_index=True, default=0, editable=False),
+            preserve_default=False,
+        ),
+    ]
diff --git a/projects/migrations/0044_auto_20160921_2353.py b/projects/migrations/0044_auto_20160921_2353.py
new file mode 100644
index 0000000..3ee89be
--- /dev/null
+++ b/projects/migrations/0044_auto_20160921_2353.py
@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.7 on 2016-09-21 20:53
+from __future__ import unicode_literals
+
+from django.db import migrations
+import django.db.models.deletion
+import mptt.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('projects', '0043_auto_20160921_2324'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='realty',
+            name='building_classification',
+            field=mptt.fields.TreeForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='realties', to='projects.BuildingClassfication'),
+        ),
+    ]
diff --git a/projects/migrations/0045_auto_20160922_0039.py b/projects/migrations/0045_auto_20160922_0039.py
new file mode 100644
index 0000000..1881f4f
--- /dev/null
+++ b/projects/migrations/0045_auto_20160922_0039.py
@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.7 on 2016-09-21 21:39
+from __future__ import unicode_literals
+
+from django.db import migrations
+import django.db.models.deletion
+import mptt.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('projects', '0044_auto_20160921_2353'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='portfolio',
+            name='building_classification',
+            field=mptt.fields.TreeForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='portfolios', to='projects.BuildingClassfication'),
+        ),
+    ]
diff --git a/projects/models.py b/projects/models.py
index a0c493c..22a72a1 100644
--- a/projects/models.py
+++ b/projects/models.py
@@ -5,7 +5,7 @@ from django.db.models import Q
 from django.core.exceptions import ValidationError
 from django.utils import timezone
 from hitcount.models import HitCountMixin
-from mptt.models import TreeForeignKey
+from mptt.models import TreeForeignKey, MPTTModel
 import pydash as _; _.map = _.map_; _.filter = _.filter_
 
 from users.models import User, Team
@@ -33,8 +33,9 @@ TERM_TYPE_MORPHS = {
 }
 
 
-class BuildingClassfication(models.Model):
+class BuildingClassfication(MPTTModel):
     name = models.CharField(max_length=255)
+    parent = TreeForeignKey('self', blank=True, null=True, related_name='children', db_index=True)
 
     def __str__(self):
         return self.name
@@ -56,7 +57,7 @@ class ConstructionType(models.Model):
 
 
 class Realty(models.Model):
-    building_classification = models.ForeignKey(BuildingClassfication, related_name='realties')
+    building_classification = TreeForeignKey(BuildingClassfication, related_name='realties')
     construction_type = models.ForeignKey(ConstructionType, related_name='realties')
     location = TreeForeignKey('common.Location', related_name='realties', null=True, blank=True)
     name = models.CharField(max_length=255)
@@ -319,7 +320,7 @@ class Candidate(models.Model):
 
 class Portfolio(models.Model):
     budget = models.DecimalField(max_digits=10, decimal_places=0, default=0, null=True, blank=True)
-    building_classification = models.ForeignKey(BuildingClassfication, related_name='portfolios', null=True, blank=True)
+    building_classification = TreeForeignKey(BuildingClassfication, related_name='portfolios', null=True, blank=True)
     construction_type = models.ForeignKey(ConstructionType, related_name='portfolios', null=True, blank=True)
     created = models.DateTimeField(auto_now_add=True, auto_created=True)
     currency = models.CharField(max_length=20, default='rur', choices=CURRENCIES, null=True, blank=True)
diff --git a/projects/templates/customer_project_create.html b/projects/templates/customer_project_create.html
index 03ab236..bd9adfe 100644
--- a/projects/templates/customer_project_create.html
+++ b/projects/templates/customer_project_create.html
@@ -237,14 +237,15 @@
                                         value="{{ realty_form.name.value }}">
                                 </div>
                                 <div class="col-lg-3">
-                                    <select
-                                        id="realtyBuildingClassificationId"
-                                        class="selectpicker"
-                                        name="{{ realty_form.building_classification.html_name }}">
-                                            {% for c in realty_form.building_classification.field.queryset %}
-                                                <option value="{{ c.pk }}" {% if realty_form.building_classification.value|int == c.pk %}selected="selected"{% endif %}>{{ c.name }}</option>
-                                            {% endfor %}
-                                    </select>
+                                    {{ realty_form.building_classification }}
+{#                                    <select#}
+{#                                        id="realtyBuildingClassificationId"#}
+{#                                       #}
+{#                                        name="{{ realty_form.building_classification.html_name }}">#}
+{#                                            {% for c in realty_form.building_classification.field.queryset %}#}
+{#                                                <option value="{{ c.pk }}" {% if realty_form.building_classification.value|int == c.pk %}selected="selected"{% endif %}>{{ c.name }}</option>#}
+{#                                            {% endfor %}#}
+{#                                    </select>#}
                                 </div>
                                 <div class="col-lg-3">
                                     <select
diff --git a/users/forms.py b/users/forms.py
index ffd11b7..cb6ae7e 100644
--- a/users/forms.py
+++ b/users/forms.py
@@ -26,6 +26,7 @@ class ContractorResumeForm(forms.ModelForm):
             'text',
         )
 
+
 class ContractorResumeFilesForm(forms.ModelForm):
     class Meta:
         model = ContractorResumeFiles
diff --git a/users/templates/worksell_create_form.html b/users/templates/worksell_create_form.html
index 9d072b3..2a29eb3 100644
--- a/users/templates/worksell_create_form.html
+++ b/users/templates/worksell_create_form.html
@@ -95,11 +95,11 @@
        </div>
 
         <div class="polsF1 disTab">
-            <input type="hidden" name="{{ worksell_form.contractor.html_name }}" value="{{ request.user.pk }}" />
+            <input type="hidden" name="{{ worksell_form.contractor.html_name }}" value="{{ request.user.pk }}" >
         </div>
 
         <div class="polsF1 disTab">
-              <input type="hidden" name="images-ids" id="upload-files-worksell-pk"  />
+              <input type="hidden" name="images-ids" id="upload-files-worksell-pk"  >
 
         </div>
 
diff --git a/work_sell/forms.py b/work_sell/forms.py
index ae67fa3..0195e9d 100644
--- a/work_sell/forms.py
+++ b/work_sell/forms.py
@@ -1,9 +1,11 @@
 import itertools
 from django import forms
+from mptt.forms import TreeNodeChoiceField
 
 from common.models import Location, LiveImageUpload
 from .models import WorkSell, WorkSellPhoto
 from specializations.models import Specialization
+from projects.models import BuildingClassfication
 
 
 class ContractorWorkSellTrashForm(forms.Form):
@@ -30,6 +32,11 @@ class WorkSellForm(forms.ModelForm):
         widget=forms.CheckboxSelectMultiple,
         required=False,
     )
+
+    building_classification = TreeNodeChoiceField(
+        BuildingClassfication.objects.exclude(name='_root'),
+        widget=forms.Select(attrs={'class': 'selectpicker'}),
+    )
     
     class Meta:
         model = WorkSell
@@ -38,7 +45,7 @@ class WorkSellForm(forms.ModelForm):
             'building_classification',
             'construction_type',
             'specialization',
-            
+            'contractor',
             'budget',
             'currency',
             'description',
@@ -49,7 +56,6 @@ class WorkSellForm(forms.ModelForm):
         )
         
         widgets = {
-            'building_classification': forms.Select(attrs={'class': 'selectpicker'}),
             'construction_type': forms.Select(attrs={'class': 'selectpicker'}),
             'currency': forms.Select(attrs={'class': 'selectpicker'}),
             'term_type': forms.Select(attrs={'class': 'selectpicker'}),
diff --git a/work_sell/migrations/0017_auto_20160922_0057.py b/work_sell/migrations/0017_auto_20160922_0057.py
new file mode 100644
index 0000000..22101fb
--- /dev/null
+++ b/work_sell/migrations/0017_auto_20160922_0057.py
@@ -0,0 +1,22 @@
+# -*- coding: utf-8 -*-
+# Generated by Django 1.9.7 on 2016-09-21 21:57
+from __future__ import unicode_literals
+
+from django.db import migrations
+import django.db.models.deletion
+import mptt.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('work_sell', '0016_worksell_work_type'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='worksell',
+            name='building_classification',
+            field=mptt.fields.TreeForeignKey(blank=True, null=True, on_delete=django.db.models.deletion.CASCADE, related_name='worksells', to='projects.BuildingClassfication'),
+        ),
+    ]
diff --git a/work_sell/models.py b/work_sell/models.py
index e94db8e..37af935 100644
--- a/work_sell/models.py
+++ b/work_sell/models.py
@@ -12,7 +12,7 @@ class WorkSell(models.Model):
     # TODO: Add consistency ("work_sell" vs "worksell"):
     
     budget = models.DecimalField(max_digits=10, decimal_places=0, default=0, null=True, blank=True)
-    building_classification = models.ForeignKey(BuildingClassfication, related_name='worksells', null=True, blank=True)
+    building_classification = TreeForeignKey(BuildingClassfication, related_name='worksells', null=True, blank=True)
     construction_type = models.ForeignKey(ConstructionType, related_name='worksells', null=True, blank=True)
     contractor = models.ForeignKey(User, related_name='work_sell', null=True, blank=True)  # TODO: Pluralize related name
     created = models.DateTimeField(auto_now_add=True)