We may not be able to generate sufficient cash to service all of our indebtedness and may be forced to take other actions to satisfy our obligations under our indebtedness, which may not be successful.
Our ability to make scheduled payments on or to refinance our debt obligations depends on our financial condition, operating performance and our ability to receive dividend payments from our subsidiaries, which is subject to prevailing economic and competitive conditions, regulatory approval and certain financial, business and other factors beyond our control.
We may not be able to maintain a level of cash flows from operating activities sufficient to permit us to pay the principal and interest on our indebtedness.
If our cash flows and capital resources are insufficient to fund our debt service obligations, we may be forced to reduce or delay investments and capital expenditures, or to sell assets, seek additional capital or restructure or refinance our indebtedness.
These alternative measures may not be successful and may not permit us to meet our scheduled debt service obligations.
In addition, the terms of existing or future debt instruments may restrict us from adopting some of these alternatives.
Our ability to restructure or refinance our debt will depend on the condition of the capital markets and our financial condition at such time.
Any refinancing of our debt could be at higher interest rates and may require us to comply with more onerous covenants, which could further restrict our business operations.
In addition, any failure to make payments of interest and principal on our outstanding indebtedness on a timely basis would likely result in a reduction of our credit rating, which could harm our ability to incur additional indebtedness.
If our cash flows and available cash are insufficient to meet our debt service obligations, we could face substantial liquidity problems and might be required to dispose of material assets or operations to meet our debt service and other obligations.
We may not be able to consummate those dispositions or to obtain the proceeds that we could realize from them, and these proceeds may not be adequate to meet any debt service obligations then due.
ITEM 1B.
UNRESOLVED STAFF COMMENTS None.
ITEM 2.
PROPERTIES A summary of our significant locations at December 31, 2012 is shown in the following table.
All facilities are leased, except for 165,000 square feet of our office in Alpharetta, Georgia.
Square footage amounts are net of space that has been sublet or part of a facility restructuring.
## Table 0 ##
All of our facilities are used by either our trading and investing or balance sheet management segments, in addition to the corporate/other category.
All other leased facilities with space of less than 25,000 square feet are not listed by location.
In addition to the significant facilities above, we also lease all 30 E*TRADE branches, ranging in space from approximately 2,500 to 8,000 square feet.
We believe our facilities space is adequate to meet our needs in 2013.
The following sections describe in detail the changes in key operating factors and other changes and events that affected net revenue, provision for loan losses, operating expense, other income (expense) and income tax expense (benefit).
Revenue The components of revenue and the resulting variances are as follows (dollars in millions
## Table 1 ##
Net Operating Interest Income Net operating interest income decreased 1% to $1.2 billion for the year ended December 31, 2011 compared to 2010.
Average enterprise interest-earning assets increased 4% to $42.7 billion for the year ended December 31, 2011 compared to 2010.
This was primarily a result of the increases in average margin receivables and average available-for-sale and held-to-maturity securities, offset by decreases in average loans and average cash and equivalents.
Average enterprise interest-bearing liabilities increased 4% to $40.1 billion for the year ended December 31, 2011 compared to 2010.
The increase in average enterprise interest-bearing liabilities was primarily due to increases in average sweep deposits and average customer payables, offset by a decrease in average securities sold under agreements to repurchase.
Enterprise net interest spread decreased by 12 basis points to 2.79% for the year ended December 31, 2011 compared to 2010, reflecting yields on average enterprise interest-earning assets and the interest rate environment.
Commissions Commissions revenue increased 1% to $436.2 million for the year ended December 31, 2011 compared to 2010.
DART volume increased 5% to 157,475 for the year ended December 31, 2011 compared 2010.
Option- related DARTs as a percentage of total DARTs represented 20% of trading volume for the year ended December 31, 2011 compared to 17% in 2010.
Exchange-traded funds-related DARTs as a percentage of total DARTs represented 11% of trading volume for the year ended December 31, 2011 compared to 10% in 2010.
Average commission per trade decreased 2% to $11.01 for the year ended December 31, 2011 compared to 2010.
The decrease was driven by a change in customer mix; specifically customers who have a higher commission per trade traded less during the year compared to active trader customers, who generally have lower commissions per trade, when compared to 2010.
in the form of common equity, such as trust preferred securities, divided by total risk-weighted assets.
The following table shows the calculation of the Tier 1 common ratio (dollars in millions):
## Table 2 ##
In June 2012, the U. S.  Federal banking agencies published notices of proposed rulemaking for comment related to the implementation of the Basel III framework for the calculation and components of a banking organization’s regulatory capital and a U. S.  version of the international standardized approach for calculating a banking organization’s risk-weighted assets.
In November 2012, the banking agencies announced a delay in the implementation of Basel III in the U. S.  and have not yet issued final Basel III rules.
We believe the most relevant elements of the proposal to us relate to the proposed risk-weighting of mortgage loans and margin receivables in addition to the inclusion in the calculation of Common Tier 1 capital of unrealized gains (losses) on all availablefor-sale debt securities.
Under the current proposal, we do not believe the incorporation of these elements have a significant impact on our current capital ratios; however, the final impact of the Basel III capital standards on regulatory requirements will remain uncertain until the final rules implementing Basel III are adopted for U. S.  institutions.
We will continue to monitor the ongoing rule-making and comment process to assess both the timing and the impact of the Dodd-Frank Act and Basel III capital standards on our business.
On October 9, 2012, the Federal Reserve adopted final regulations implementing the requirement for certain Federal Reserve-regulated savings and loan holding companies, including the Company, to conduct company-run stress tests on an annual basis.
Under the Federal Reserve’s stress test regulations, we will be required to utilize stress-testing methodologies providing for results under at least three different sets of conditions, including baseline, adverse, and severely adverse conditions.
The final regulations will apply to the Company in the fall of the calendar year after it becomes subject to minimum capital requirements, a period which has not yet been specified.
We conducted a company-run stress test for the Company, which we believe is consistent with the Federal Reserve’s methodologies, and provided the results to the Federal Reserve with the submission of the long-term strategic and capital plan.
Also on October 9, 2012, the OCC adopted final regulations implementing the requirement for national banks or federal savings associations with over $10 billion in average total consolidated assets, including E*TRADE Bank, to conduct company-run stress tests on an annual basis.
Under the OCC’s stress test regulations, E*TRADE Bank also will be required to utilize stress-testing methodologies providing for results under at least three different sets of conditions, including baseline, adverse and severely adverse scenarios.
The final regulations require E*TRADE Bank to conduct its first stress test using financial statement data as of September 30, 2013, and it will be required to report results to the OCC on or before March 31, 2014.
We conducted a company-run stress test for E*TRADE Bank, which we believe is consistent with the OCC’s methodologies, and provided the results to the OCC with submission of the long-term strategic and capital plan.
Other Sources of Liquidity We also maintain uncommitted lines of credit with unaffiliated banks to finance margin lending, with available balances subject to approval when utilized.
At December 31, 2012, there were no outstanding balances.
We rely on borrowed funds, from sources such as securities sold under agreements to repurchase and FHLB advances, to provide liquidity for E*TRADE Bank.
Our ability to borrow these funds is dependent upon the continued availability of funding in the wholesale borrowings market.
In addition, we can borrow from the Federal Reserve Bank’s discount window to meet short-term liquidity requirements, although it is not viewed as a primary source of funding.
At December 31, 2012, E*TRADE Bank had approximately $3.9 billion and $1.1 billion in additional collateralized borrowing capacity with the FHLB and the Federal Reserve Bank, respectively.
We also have the ability to generate liquidity in the form of additional deposits by raising the yield on our customer deposit account products.
Off-Balance Sheet Arrangements We enter into various off-balance-sheet arrangements in the ordinary course of business, primarily to meet the needs of our customers and to reduce our own exposure to interest rate risk.
These arrangements include firm commitments to extend credit and letters of credit.
Additionally, we enter into guarantees and other similar arrangements as part of transactions in the ordinary course of business.
For additional information on each of these arrangements, see Note 19—Commitments, Contingencies and Other Regulatory Matters of Item 8.
Financial Statements and Supplementary Data.
Contractual Obligations and Commitments The following table summarizes our contractual obligations at December 31, 2012 and the effect such obligations are expected to have on our liquidity and cash flow in future periods (dollars in millions):
## Table 3 ##
(1) Includes annual interest based on the contractual features of each transaction, using market rates at December 31, 2012.
Interest rates are assumed to remain at current levels over the life of all adjustable rate instruments.
(2) For subordinated debentures included in other borrowings, does not assume early redemption under current conversion provisions.
(3) Includes annual interest payments.
Does not assume conversion for the non-interest bearing convertible debentures due 2019.
(4) Does not include sweep deposits, complete savings deposits, other money market and savings deposits or checking deposits as there are no stated maturity dates and /or scheduled contractual payments.
(5) Includes facilities restructuring leases with initial or remaining terms in excess of one year and is net of estimated future sublease income.
(6) Includes material purchase obligations for goods and services covered by non-cance

<table><tr><td>Location</td><td>Approximate Square Footage</td></tr><tr><td>Alpharetta, Georgia</td><td>254,000</td></tr><tr><td>Jersey City, New Jersey</td><td>107,000</td></tr><tr><td>Arlington, Virginia</td><td>102,000</td></tr><tr><td>Menlo Park, California</td><td>91,000</td></tr><tr><td>Sandy, Utah</td><td>66,000</td></tr><tr><td>New York, New York</td><td>39,000</td></tr><tr><td>Chicago, Illinois</td><td>25,000</td></tr></table>
<table><tr><td></td><td colspan="2">Year Ended December 31,</td><td colspan="2">Variance 2011 vs. 2010</td></tr><tr><td></td><td>2011</td><td>2010</td><td>Amount</td><td>%</td></tr><tr><td>Net operating interest income</td><td>$1,220.0</td><td>$1,226.3</td><td>$-6.3</td><td>-1%</td></tr><tr><td>Commissions</td><td>436.2</td><td>431.0</td><td>5.2</td><td>1%</td></tr><tr><td>Fees and service charges</td><td>130.4</td><td>142.4</td><td>-12.0</td><td>-8%</td></tr><tr><td>Principal transactions</td><td>105.4</td><td>103.4</td><td>2.0</td><td>2%</td></tr><tr><td>Gains on loans and securities, net</td><td>120.2</td><td>166.2</td><td>-46.0</td><td>-28%</td></tr><tr><td>Net impairment</td><td>-14.9</td><td>-37.7</td><td>22.8</td><td>-60%</td></tr><tr><td>Other revenues</td><td>39.3</td><td>46.3</td><td>-7.0</td><td>-15%</td></tr><tr><td>Total non-interest income</td><td>816.6</td><td>851.6</td><td>-35.0</td><td>-4%</td></tr><tr><td>Total net revenue</td><td>$2,036.6</td><td>$2,077.9</td><td>$-41.3</td><td>-2%</td></tr></table>
<table><tr><td></td><td colspan="3">December 31,</td></tr><tr><td></td><td>2012</td><td>2011</td><td>2010</td></tr><tr><td>Shareholders’ equity</td><td>$4,904.5</td><td>$4,928.0</td><td>$4,052.4</td></tr><tr><td>Deduct:</td><td></td><td></td><td></td></tr><tr><td>Losses in other comprehensive income on available-for-sale debt securities and cash flow hedges, net of tax</td><td>-315.4</td><td>-389.6</td><td>-439.9</td></tr><tr><td>Goodwill and other intangible assets, net of deferred tax liabilities</td><td>1,899.4</td><td>1,947.5</td><td>2,046.4</td></tr><tr><td>Subtotal</td><td>3,320.5</td><td>3,370.1</td><td>2,445.9</td></tr><tr><td>Deduct:</td><td></td><td></td><td></td></tr><tr><td>Disallowed servicing assets and deferred tax assets</td><td>1,278.9</td><td>1,331.0</td><td>1,351.3</td></tr><tr><td>Tier 1 common</td><td>$2,041.6</td><td>$2,039.1</td><td>$1,094.6</td></tr><tr><td>Total risk-weighted assets</td><td>$19,849.9</td><td>$21,668.1</td><td>$22,915.8</td></tr><tr><td>Tier 1 common ratio (Tier 1 common / Total risk-weighted assets)</td><td>10.3%</td><td>9.4%</td><td>4.8%</td></tr></table>
<table><tr><td></td><td colspan="5"> Payments Due by Period</td></tr><tr><td></td><td> Less Than 1 Year</td><td> 1-3 Years</td><td> 3-5 Years</td><td> Thereafter</td><td> Total</td></tr><tr><td>Securities sold under agreements to repurchase<sup>-1</sup></td><td>$3,421.1</td><td>$578.9</td><td>$514.6</td><td>$—</td><td>$4,514.6</td></tr><tr><td>FHLB advances and other borrowings<sup>-1(2)</sup></td><td>188.3</td><td>136.7</td><td>688.4</td><td>648.2</td><td>1,661.6</td></tr><tr><td>Corporate debt<sup>-3</sup></td><td>110.7</td><td>221.3</td><td>1,111.0</td><td>938.3</td><td>2,381.3</td></tr><tr><td>Uncertain tax positions</td><td>1.3</td><td>1.9</td><td>136.6</td><td>352.2</td><td>492.0</td></tr><tr><td>Certificates of deposit and brokered certificates of deposit<sup>-1(4)</sup></td><td>66.3</td><td>34.0</td><td>9.0</td><td>0.4</td><td>109.7</td></tr><tr><td>Operating lease payments<sup>-5</sup></td><td>21.5</td><td>44.4</td><td>41.4</td><td>58.4</td><td>165.7</td></tr><tr><td>Purchase obligations<sup>-6</sup></td><td>59.2</td><td>24.5</td><td>—</td><td>—</td><td>83.7</td></tr><tr><td>Total contractual obligations</td><td>$3,868.4</td><td>$1,041.7</td><td>$2,501.0</td><td>$1,997.5</td><td>$9,408.6</td></tr></table>

Question: What is the average amount of Alpharetta, Georgia of Approximate Square Footage, and Net operating interest income of Year Ended December 31, 2011 ?