identifying a developer or investor to acquire a portion or all of the property or to contribute into a potential joint venture to redevelop the property. We are pursuing entitlements for the potential redevelopment of these parcels, along with certain other adjacent land parcels, some of which we have under contract for purchase. As of June 30, 2020, we have incurred approximately $1.5 million in raze and entitlement costs related to these parcels.
Other Real Estate Assets. The Company owns mitigation credits with a cost basis of approximately $2.5 million as of June 30, 2020. As of December 31, 2019, the Company owned mitigation credits with a cost basis of approximately $2.3 million. The increase in mitigation credit cost basis for the six months ended June 30, 2020 compared to December 31, 2019 is primarily the result of the 20 mitigation credits acquired from the Mitigation Bank, as defined in Note 7, “Investments in Joint Ventures”, during the three months ended March 31, 2020 totaling approximately $1.5 million, or approximately $75,000 per credit. The cost basis was reduced by the impact of approximately 16 mitigation credits with a cost basis of approximately $1.2 million that were provided at no cost to buyers. Additionally, the Company purchased 2 mitigation credits from the Mitigation Bank JV, for approximately $224,000. The aggregate cost of sales charge of approximately $1.5 million, which is not expected to be a recurring charge, was included in direct costs of revenues of real estate operations during the six months ended June 30, 2020 in the consolidated statements of operations. Mitigation credit sales totaled approximately $4,000 during the six months ended June 30, 2020. There were no mitigation credit sales during the six months ended June 30, 2019.
Subsurface Interests. As of June 30, 2020, the Company owns full or fractional subsurface oil, gas, and mineral interests underlying approximately 455,000 “surface” acres of land owned by others in 20 counties in Florida (the “Subsurface Interests”). The Company leases certain of the Subsurface Interests to mineral exploration firms for exploration. Our subsurface operations consist of revenue from the leasing of exploration rights and in some instances, additional revenues from royalties applicable to production from the leased acreage.
There were no subsurface sales during the six months ended June 30, 2020 and 2019.
Prior to September 2019, the Company leased certain of the Subsurface Interests to a mineral exploration organization for exploration. The lessee had previously exercised renewal options through the eighth year of the lease which ended on September 22, 2019. The Lessee elected not to renew the oil exploration lease beyond September 22, 2019.
Lease income generated by the annual lease payments is recognized on a straight-line basis over the guaranteed lease term. For both the three and six months ended June 30, 2019, lease income of approximately $201,000 was recognized, with no lease income recognized during the three and six months ended June 30, 2020.
During the three and six months ended June 30, 2020 and 2019, the Company also received oil royalties from operating oil wells on 800 acres under a separate lease with a separate operator. Revenues received from oil royalties totaled approximately $20,000 during the three months ended June 30, 2019 with no revenues received during the three months ended June 30, 2020. Revenues received from oil royalties totaled approximately $10,000 and $29,000, during the six months ended June 30, 2020 and 2019, respectively.
The Company is not prohibited from selling any or all of its Subsurface Interests. The Company may release surface entry rights or other rights upon request of a surface owner for a negotiated release fee typically based on a percentage of the surface value. Should the Company complete a transaction to sell all or a portion of its Subsurface Interests or complete a release transaction, the Company may utilize the like-kind exchange structure in acquiring one or more replacement investments including income-producing properties.
Cash payments for the release of surface entry rights totaled approximately $67,000 during the six months ended June 30, 2020. There were no releases of surface entry rights during the six months ended June 30, 2019.
Real Estate Operations – Discontinued Operations
As of June 30, 2020, the Company continues to pursue land sales of the approximately 4,900 acres that formerly comprised its land holdings on behalf of the JV Partners in its role as Manager of the Land JV. See Note 24, “Subsequent Events”, for land sales from the Land JV subsequent to June 30, 2020. As a result of those land sales, the Land JV currently holds approximately 1,800 acres of undeveloped land in Daytona Beach, Florida. The Company’s retained interest in the Land JV represents a notional 33.5% stake in the venture, the value of which may be realized in the form of distributions based on the timing and the amount of proceeds achieved when the land is ultimately sold by the Land JV. As of June 30,