Cost of services as a percentage of revenue was 56.7% in the first quarter of 2019 compared to 59.8% in the same period of 2018. The 310 basis point improvement is primarily attributable to the fixed cost component being spread over the higher revenue base and is evidence that our cost increases relative to growth in personnel is commensurate with our revenue increases.
Operating, administrative, and other expenses were down by approximately $0.9 million, or 1.9% for the first quarter of 2019 when compared to the same period in 2018. This decrease was primarily due to a decrease in compensation-related expenses from the $4.2 millionnon-recurring cash payment related to the Additional Compensation Award recognized in the first quarter of 2018, partially offset by increases in other incentive compensation accruals. All other operating expenses were largely in line with the level of business activity with the exception of an increase in professional fees due to the pending merger with JLL.
Also, as shown on slides 29, interest and other income decreased approximately $1.0 million in the first quarter, primarily as a result of a decrease in the Company’s valuation of mortgage servicing rights.
The Company’s Freddie Mac business has been very strong the past three years with a record level of originations in 2018 of $7.0 billion and originations of $6.8 billion in 2017. In the first quarter of 2019, Freddie Mac originations totaled $1.3 billion as compared to $1.8 billion in the first quarter of 2018.
Earnings per share on a fully diluted basis increased $0.27 to $0.69 compared to $0.42 for the first quarter of 2018.
The Company’s effective tax rate for the quarter ended March 31, 2019, was 27.4% as compared to 29.9% for the same period in 2018, before consideration of the windfall adjustments in both periods.
Slides 32 through 33 relate to the balance sheet and liquidity. Our cash balance, net of client advances, at March 31, 2019 was $230.8 million compared to $301.0 million at December 31, 2018.
As shown on Slide 31, during the first quarter 2019, the Company generated $19.8 million in cash from operating activities, net of a $3.3 million increase in client advances as compared to $3.2 million of cash provided by operating activities, net of a $5.1 million decrease in client advances, during the same period of 2018 representing an increase of $16.6 million. The Company’s use of cash is typically related to the limited working capital needs during the year and the payment of taxes. The Company has virtually no Corporate level debt to service other than that related to our Freddie Mac business which is offset with the mortgage notes receivable.
As shown on Slide 32, our balance sheet as of March 31, 2019 included $961.3 million of outstanding borrowings on 31 loans under our warehouse credit facilities to support our Freddie Mac multifamily business, and we also had a corresponding asset recorded for the related mortgage notes receivable. To date, 13 of these loans have been purchased by Freddie Mac.