Our headquarters is located in leased offices in Westlake, Texas. The lease consists of approximately 150,000 square feet and expires in January 2031. As of December 31, 2020, our company-owned insurance brokerage business leases approximately 237,000 square feet of office space in Texas, Nevada, Illinois,and North Carolina under nine leases. These offices are typically located in small office parks, generally with lease terms of five to ten years. We believe that all of our properties and facilities are well maintained.
◦Outside of Texas as of December 31, 2020, 285 operating franchises had less than one year of tenure and 378 had greater than one year of tenure.
We expect that redemptions and exchanges of LLC Units will result in increases in the tax basis in our share of the tangible and intangible assets of Goosehead Financial, LLC that otherwise would not have been available. These increases in tax basis may reduce the amount of tax that we would otherwise be required to pay in the future. The tax receivable agreement requires Goosehead Insurance, Inc. to pay 85% of the amount of cash savings, if any, in U.S. federal, state and local income tax or franchise tax that we actually realize to the Pre-IPO LLC Members. Furthermore, payments under the tax receivable agreement give rise to additional tax benefits and therefore additional payments under the tax receivable agreement itself. See "Item 13. Certain relationships and related transactions, and director independence".
(1) Renewal Commissions, New Business Commissions, Agency Fees, and Contingent Commissions are included in "Commissions and agency fees" as shown on the Consolidated statements of operations.
For the year ended December 31, 2020, we had $1.074 billion in Total Written Premium, representing a 45% increase, compared to $739 million for the year ended December 31, 2019. The following table shows Total Written Premium by channel for the years ended 2020 and 2019 (in thousands).
Ancillary Revenue is a supplemental measure of our performance and includes Contingent Commissions and Other Income. We believe that Ancillary Revenue is an appropriate measure of operating performance because it summarizes revenues that are ancillary to our core business.
General and administrative expenses increased by $6.5 million, or 34%, to $25.5 million for 2020 from $19.0 million for 2019. This increase was attributable to $1.0 million of expenses related to operating as a public company, and increases in expenses related to continued development of technology of $4.5 million. The remainder of the increase is attributable to higher costs associated with an increase in operating franchises and employees.
In connection with the Offering we entered into a tax receivable agreement with the Pre-IPO LLC Members that will provide for the payment by us to the Pre-IPO LLC Members of 85% of the amount of cash savings, if any, in U.S. federal, state and local income tax or franchise tax that we actually realize as a result of (i) any increase in tax basis
The Company records franchise fees receivable net of an allowance for estimated uncollectible accounts to reflect any loss anticipated related to the franchise fees receivable balances and charged to bad debts. The franchise fees receivable balance consists of numerous small-balance, homogeneous accounts. The Company calculates the allowance based on our history of write offs for all franchise accounts. Franchise fees receivable and the related allowance is charged off to bad debts if the franchisee owing the balance terminates.
annual effective tax rates related to enacted changes in tax laws, and minor improvements related to employee stock ownership plans and investments in qualified affordable housing projects accounted for using the equity method. This standard is effective for annual reporting periods beginning after December 15, 2020, including interim periods therein. We do not expect the adoption of ASU 2019-12 to have a material impact to our consolidated financial statements.
(3) The quarterly results are shown under ASC 605, as the Company was required to show the impact of the changes in revenue recognition on a full-year basis for 2019.