Maybe/app/views/accounts/accountables/_property.html.erb

<%# locals: (f:) %>

<div>
  <hr class="my-4">

  <div class="space-y-2">
    <%= f.fields_for :accountable do |af| %>
      <div class="flex gap-2">
        <%= af.number_field :year_built, label: t(".year_built"), placeholder: 2005 %>
        <%= af.number_field :area_value, label: t(".area_value"), placeholder: 2000 %>
        <%= af.select :area_unit,
                  [["Square feet", "sqft"], ["Square meters", "sqm"]],
                  { label: t(".area_unit") } %>
      </div>

      <%= af.fields_for :address do |address_form| %>
        <div class="flex gap-2">
          <%= address_form.text_field :line1, label: t(".line1"), placeholder: "123 Main St", required: true %>
          <%= address_form.text_field :line2, label: t(".line2"), placeholder: "Apt 1" %>
        </div>

        <div class="flex gap-2">
          <%= address_form.text_field :locality, label: t(".city"), placeholder: "Sacramento", required: true %>
          <%= address_form.text_field :region, label: t(".state"), placeholder: "CA", required: true %>
        </div>

        <div class="flex gap-2">
          <%= address_form.text_field :postal_code, label: t(".postal_code"), placeholder: "95814" %>
          <%= address_form.text_field :country, label: t(".country"), placeholder: "USA", required: true %>
        </div>
      <% end %>
    <% end %>
  </div>
</div>