From the I-864 instructions page 8:
QUOTE
Only complete this Part if you need to use the value of assets to meet the income requirements. If your Total Household Income (indicated on Line 24c) is equal to or more than needed to meet the income requirement as shown by the current Poverty Guidelines (Form I-864P) for your household size (indicated on Line 21h), you do not need to complete this Part. If your total household income does not meet the requirement, you may submit evidence of the value of your assets, the sponsored immigrant's assets, and/or assets of a household member that can be used, if necessary, for the support of the intending immigrant(s). The value of assets of all of these persons may be combined in order to meet the necessary requirement.
Only assets that can be converted into cash within one year and without considerable hardship or financial loss to theowner may be included. The owner of the asset must include a description of the asset, proof of ownership, and the basis for the owner's claim of its net cash value.
You may include the net value of your home as an asset. The net value of the home is the appraised value of the home,minus the sum of any and all loans secured by a mortgage,trust deed, or other lien on the home. If you wish to include the net value of your home, this, you must include documentation demonstrating that you own it, a recent appraisal by a licensed appraiser, and evidence of the amount of any and all loans secured by a mortgage, trust deed, or other lien on the home. You may not include the net value an automobile unless you show that you have more than one automobile, and at least one automobile is not included as an asset.
To use your own assets, you must complete lines 26a through26d and submit corresponding evidence with this form.Supporting evidence must be attached to establish location,ownership, date of acquisition, and value of any real estate holding.
Nothing needs to be notarized for form I-864, signing that form is considered swearing that all attached evidence for the form is tru and correct.