JACOBS, Justice,
for the Majority:
Tony Ashburn & Son, Inc. (“Ashburn”), appeals from a Superior Court judgment affirming a decision of the Kent County Regional Planning Commission (“Commission”) denying Ashburn’s application for subdivision approval. On appeal, Ashburn argues that the Superior Court erroneously upheld the Commission’s decision, which was contrary to law and not based on substantial evidence. Because we conclude that the Commission acted contrary to law and reverse on that ground, we do not reach Ashburn’s alternative claim that the Commission’s decision lacked eviden-tiary support.
FACTUAL AND PROCEDURAL BACKGROUND2
Ashburn owns 254.33 +/- acres of land (the “property”) located in an unincorpo[237]*237rated area of Kent County, Delaware. On July 27, 2006, Ashburn filed an Application for Subdivision Plan Approval (“application”) 3 with the Kent County Department of Planning Services (the “Planning Office”) to subdivide the property in order to develop a single family residential subdivision (the “subdivision”). The property is zoned Agricultural Conservation (“AC”), which permits the development of single family houses at a density of up to one unit per acre. Ashburn’s proposed subdivision would consist of 214 lots with a density of .84 units per acre and would be served by an on-site water and septic system provided by private utilities. It is undisputed that Ashburn’s application complied with all applicable planning and zoning requirements.
On September 7, 2006 the Planning Office, having concluded that the application complied with the Kent County Comprehensive Plan and Zoning District Provisions, recommended approval of the application, subject to certain recommendations. On that same day, the Commission held a public hearing,4 at which Ashburn presented testimony that the proposed subdivision complied with State and County criteria for protecting the health, safety and welfare of Kent County residents. Several residents testified against the application, arguing that the subdivision was outside the so-called Growth Zone,5 and would cause the schools to become overcrowded and would unduly increase the traffic in the area.
The Commission solicited comments from various state agencies about the impact of Ashburn’s proposed development. That took place as part of the Preliminary Land Use Service process (“PLUS Review”).6 The Office of State Planning Coordination (“OSPC”) filed comments with the Commission, emphasizing that the proposed development was located in an “Investment Level 4” area, in which the State will only support agricultural preservation, natural resource protection, and continuation of the rural nature of that area. New development in an Investment Level 4 area is not supported. OSPC further claimed that development of Ash-burn’s site would be inappropriate, because the cost to the State of providing services in the area would be wasteful and inefficient, there being no existing plan to invest in infrastructure in the area aside from necessary maintenance.
Other state agencies made similar comments. The Department of Transportation (“DelDOT”) announced that the State planned to maintain only existing transportation in the area, and that DelDOT wished to avoid creating isolated areas that could not be effectively or efficiently served by public services. The Department of Natural Resources and Environmental Control (“DNREC”) took the position that granting Ashburn’s subdivision would interfere with DNREC’s preservation goals, because the subdivision would [238]*238sit atop a groundwater recharge area and create water drainage problems. The Department of Agriculture also voiced opposition to the plan, as did the Smyrna School District, which stated that it did not have the capacity to absorb the additional students who would move into new developments in Kent County.
On September 14, 2006, the Commission voted to deny Ashburn’s application, citing three reasons: (1) the infrastructure was not in place, (2) the property was outside the Growth Zone, and (3) the application would negatively affect the health, safety and welfare of the community. The Commission based its denial on the comments it had received from the PLUS Review and from the aforementioned state agencies.
On September 19, 2006, Ashburn appealed the Commission’s decision to the Kent County Levy Court.7 Before the Levy Court, the Commission argued that: (1) 9 Del. C. § 4961 8 required rejection of the application because of concerns voiced by the local school district regarding school capacity; (2) increased traffic on neighboring roads would create a safety hazard; and (3) the water supply in the area would be negatively impacted. After a hearing, the Levy Court upheld the Commission’s denial of Ashburn’s subdivision application, based on the opposition of the state agencies that had previously submitted comments on Ashburn’s application.
Ashburn then appealed to the Superior Court, claiming that as a matter of law the Commission lacked the power to reject a subdivision application that complied with all applicable Kent County Subdivision and Zoning Code requirements. Ashburn argued that: (1) the Commission exceeded its powers as a matter of law; (2) preliminary site plans that comply with all applicable subdivision code provisions are entitled to approval; and (3) the Commission’s reasons for denying Ashburn’s application were both inappropriate and inadequate to support the denial. Additionally, Ashburn argued that (4) the Levy Court erred in relying solely on 9 Del. C. § 49619 as the statutory basis for upholding the Commission’s decision.
The Superior Court concluded that the Commission is vested with discretion under both the Delaware and Kent County Codes to ensure that land development proceeds in a manner consistent with the Kent County Comprehensive Plan,10 the County Zoning Code, and the Delaware Code. The Superior Court concluded that a subdivision application that complies with the subdivision code is not automatically entitled to approval, and that the Commission has discretion to deny even a conforming application. Reviewing the Commission’s denial of Ashburn’s application [239]*239for abuse of discretion, the Superior Court concluded that the record before the Levy Court provided ample basis to support the Commission’s denial. Accordingly, the Court affirmed the decision of the Levy Court.
Ashburn timely appealed to this Court. On June 18, 2006, while this appeal was pending, Kent County introduced ordinances amending its County Code. Those amendments created specific, mandatory standards relating to traffic, schools, emergency services and water that must be satisfied in order for a subdivision plan to be approved. The ordinances relating to traffic and school capacity were adopted on March 27, 2007 with an effective date retroactive to the date of their introduction (June 13, 2006). Under these new ordinances, a subdivision plan similar to Ash-burn’s would no longer comply with the Kent County Code.
ANALYSIS
On appeal, Ashburn reiterates the claims of error it advanced to the Superior Court.
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JACOBS, Justice,
for the Majority:
Tony Ashburn & Son, Inc. (“Ashburn”), appeals from a Superior Court judgment affirming a decision of the Kent County Regional Planning Commission (“Commission”) denying Ashburn’s application for subdivision approval. On appeal, Ashburn argues that the Superior Court erroneously upheld the Commission’s decision, which was contrary to law and not based on substantial evidence. Because we conclude that the Commission acted contrary to law and reverse on that ground, we do not reach Ashburn’s alternative claim that the Commission’s decision lacked eviden-tiary support.
FACTUAL AND PROCEDURAL BACKGROUND2
Ashburn owns 254.33 +/- acres of land (the “property”) located in an unincorpo[237]*237rated area of Kent County, Delaware. On July 27, 2006, Ashburn filed an Application for Subdivision Plan Approval (“application”) 3 with the Kent County Department of Planning Services (the “Planning Office”) to subdivide the property in order to develop a single family residential subdivision (the “subdivision”). The property is zoned Agricultural Conservation (“AC”), which permits the development of single family houses at a density of up to one unit per acre. Ashburn’s proposed subdivision would consist of 214 lots with a density of .84 units per acre and would be served by an on-site water and septic system provided by private utilities. It is undisputed that Ashburn’s application complied with all applicable planning and zoning requirements.
On September 7, 2006 the Planning Office, having concluded that the application complied with the Kent County Comprehensive Plan and Zoning District Provisions, recommended approval of the application, subject to certain recommendations. On that same day, the Commission held a public hearing,4 at which Ashburn presented testimony that the proposed subdivision complied with State and County criteria for protecting the health, safety and welfare of Kent County residents. Several residents testified against the application, arguing that the subdivision was outside the so-called Growth Zone,5 and would cause the schools to become overcrowded and would unduly increase the traffic in the area.
The Commission solicited comments from various state agencies about the impact of Ashburn’s proposed development. That took place as part of the Preliminary Land Use Service process (“PLUS Review”).6 The Office of State Planning Coordination (“OSPC”) filed comments with the Commission, emphasizing that the proposed development was located in an “Investment Level 4” area, in which the State will only support agricultural preservation, natural resource protection, and continuation of the rural nature of that area. New development in an Investment Level 4 area is not supported. OSPC further claimed that development of Ash-burn’s site would be inappropriate, because the cost to the State of providing services in the area would be wasteful and inefficient, there being no existing plan to invest in infrastructure in the area aside from necessary maintenance.
Other state agencies made similar comments. The Department of Transportation (“DelDOT”) announced that the State planned to maintain only existing transportation in the area, and that DelDOT wished to avoid creating isolated areas that could not be effectively or efficiently served by public services. The Department of Natural Resources and Environmental Control (“DNREC”) took the position that granting Ashburn’s subdivision would interfere with DNREC’s preservation goals, because the subdivision would [238]*238sit atop a groundwater recharge area and create water drainage problems. The Department of Agriculture also voiced opposition to the plan, as did the Smyrna School District, which stated that it did not have the capacity to absorb the additional students who would move into new developments in Kent County.
On September 14, 2006, the Commission voted to deny Ashburn’s application, citing three reasons: (1) the infrastructure was not in place, (2) the property was outside the Growth Zone, and (3) the application would negatively affect the health, safety and welfare of the community. The Commission based its denial on the comments it had received from the PLUS Review and from the aforementioned state agencies.
On September 19, 2006, Ashburn appealed the Commission’s decision to the Kent County Levy Court.7 Before the Levy Court, the Commission argued that: (1) 9 Del. C. § 4961 8 required rejection of the application because of concerns voiced by the local school district regarding school capacity; (2) increased traffic on neighboring roads would create a safety hazard; and (3) the water supply in the area would be negatively impacted. After a hearing, the Levy Court upheld the Commission’s denial of Ashburn’s subdivision application, based on the opposition of the state agencies that had previously submitted comments on Ashburn’s application.
Ashburn then appealed to the Superior Court, claiming that as a matter of law the Commission lacked the power to reject a subdivision application that complied with all applicable Kent County Subdivision and Zoning Code requirements. Ashburn argued that: (1) the Commission exceeded its powers as a matter of law; (2) preliminary site plans that comply with all applicable subdivision code provisions are entitled to approval; and (3) the Commission’s reasons for denying Ashburn’s application were both inappropriate and inadequate to support the denial. Additionally, Ashburn argued that (4) the Levy Court erred in relying solely on 9 Del. C. § 49619 as the statutory basis for upholding the Commission’s decision.
The Superior Court concluded that the Commission is vested with discretion under both the Delaware and Kent County Codes to ensure that land development proceeds in a manner consistent with the Kent County Comprehensive Plan,10 the County Zoning Code, and the Delaware Code. The Superior Court concluded that a subdivision application that complies with the subdivision code is not automatically entitled to approval, and that the Commission has discretion to deny even a conforming application. Reviewing the Commission’s denial of Ashburn’s application [239]*239for abuse of discretion, the Superior Court concluded that the record before the Levy Court provided ample basis to support the Commission’s denial. Accordingly, the Court affirmed the decision of the Levy Court.
Ashburn timely appealed to this Court. On June 18, 2006, while this appeal was pending, Kent County introduced ordinances amending its County Code. Those amendments created specific, mandatory standards relating to traffic, schools, emergency services and water that must be satisfied in order for a subdivision plan to be approved. The ordinances relating to traffic and school capacity were adopted on March 27, 2007 with an effective date retroactive to the date of their introduction (June 13, 2006). Under these new ordinances, a subdivision plan similar to Ash-burn’s would no longer comply with the Kent County Code.
ANALYSIS
On appeal, Ashburn reiterates the claims of error it advanced to the Superior Court. On appeal from a Superi- or Court decision reviewing a decision and order of an administrative agency on the record, this Court reviews the decision of the administrative agency for abuse of discretion.11 Where, as here, a County planning commission considers an application to approve a subdivision plan, it does not act in a legislative capacity but “partly in a ministerial and partly in a judicial capacity.”12 We review administrative agency decisions to determine whether the decision is supported by substantial evidence and is free from legal error.13 Substantial evidence “means such relevant evidence as a reasonable mind might accept as adequate to support a conclusion.”14 We review questions of law, including the interpretation of a statute, de novo.15
I. The Commission Lacked the Power to Deny a Legally Conforming Subdivision Plan
The central dispute on this appeal concerns the scope of the Commission’s discretion to approve or disapprove a subdivision application. Because “subdivision control involves the specific application of the applicable general standards to the particular facts of a proposed subdivision,” 16 the Commission has quasi-judicial power. The Commission does not exist “merely to rubberstamp every application that comes before it.”17 Most certainly it has a measure of discretion.18 Ashburn claims, however, that under the statutory scheme in existence at the time its subdivision plan was rejected, the Commission lacked the power to deny a subdivision plan that complied legally with all applicable zoning and subdivision requirements.
The Commission responds that 9 Del. C. § 4961 commands that the Commission consult with other state agencies when considering a subdivision application. [240]*240Moreover, in cases where the relevant state agencies present compelling reasons to deny the subdivision application, the Commission has discretion to deny even a fully conforming subdivision plan.
9 Del. C. § 4811 empowers the Commission to “approve, approve with conditions, disapprove or table” a subdivision application. That statute grants the Commission discretion when determining the proper disposition of a subdivision application. The scope of the Commission’s discretion is not explicit from the face of that statute. Ashburn claims that the fact that the General Assembly has empowered the Commission to approve a subdivision application “with conditions,” evidences the legislature’s intent to prohibit the Commission from denying an application based upon the information it receives regarding the future impact of a proposed development.
The Commission relies upon 9 Del. C. § 4802 to support its claim that its discretion is much broader, and includes the power to deny a conforming application based on concerns presented by other agencies. That statute describes the Commission’s purpose as being to:
[P]romot[e] health, safety, prosperity and general welfare, as well as for the purpose of securing coordinated plans for roads, airways, railways, public buildings, parks, playgrounds, civic centers, airports, commercial, industrial and residential developments, water supplies, sewers and sewage disposal, drainage and other improvements and utilities ... as well as for the purpose of preventing the unnecessary duplication of such improvements or utilities....
Additionally, the Commission relies on 9 Del. C. § 4961(b), which states:
As part of its review of ... subdivision application^], the county government through its designated local planning agency shall request and review information from all state and local agencies and local school districts ... and shall file as part of the record any written information provided by such state and local agencies or local school districts with respect to the ... subdivision application.
Based on these two statutory provisions, the Commission argues that its discretion includes the power to deny a subdivision application based on concerns relating to the health, safety and welfare of the community, even if the application otherwise complies with all State and County Code requirements.
The issue is whether the Commission’s argued-for statutory interpretation is correct. “An ambiguous statute should be construed ‘in a way that will promote its apparent purpose and harmonize it with other statutes’ within the statutory scheme.”19 The Commission here claims statutory authority to deny applications based on comments from state agencies that implicate the health, welfare and safety of the community. But, the very statutes upon which the Commission relies provide only that the Commission consider that information. The statutes do not, either expressly or by implication, give the Commission unfettered discretion to deny an otherwise legally conforming subdivision application based on impact-related concerns expressed by commenting state agencies.
The provisions in force at the time Ash-burn’s application was considered do sup[241]*241port the view that the Commission may consider non-Code factors (such as comments by other state agencies) to inform Commission approval of a conforming subdivision application “with conditions.” Those provisions do not, however, support a conclusion that such factors establish grounds to deny a subdivision application that otherwise fully conforms to all applicable Zoning and Subdivision Code provisions.
Delaware case law supports this conclusion. In DiFrancesco v. Mayor and Town Council of Elsmere, a local planning commission argued that “it has the power to completely reject a site plan for a project that complies with the zoning ordinance if it is fairly debatable that the project would adversely impact the public health, safety, welfare, comfort, and convenience of the neighborhood.”20 That argument was essentially the same as that being advanced by the Commission here, and the DiFran-cesco court rejected it, stating:
When people purchase land zoned for a specific use, they are entitled to rely on the fact that they can implement that use provided the project complies with all of the specific criteria found in ordinances and subject to reasonable conditions which the Planning Commission may impose in order to minimize any adverse impact on nearby landowners and residents. To hold otherwise would subject a purchaser of land zoned for a specific use to the future whim or caprice of the Commission by clothing it with the ability to impose ad hoc requirements on the use of land not specified anywhere in the ordinances. The result would be the imposition of uncertainty on all landowners respecting whether they can safely rely on the permitted uses conferred on their land under the zoning ordinances.21
The reasoning of DiFrancesco is persuasive and we adopt it here. If the Commission is empowered to deny proposals that meet all applicable statutory and Code criteria, purchasers of land would be left unable to predict whether they can develop their land in accordance with the pertinent zoning ordinances, or whether instead the County may prevent development based upon non-Code related ad hoc determinations. Here, Ashburn purchased land zoned AC, a classification that permits the kind of subdivision development that Ash-burn was proposing. Upholding a denial of Ashburn’s plan even though it complied with all Kent County Code criteria, would upset Ashburn’s reasonable development expectations when it purchased the land for development.
Similarly, in JNK, LLC v. Kent County Regional Planning Commission a land owner submitted to the Commission a plan to subdivide property that, like Ashburn’s property, was zoned AC and fell outside the Growth Zone.22 The Commission denied the application based on infrastructure, health, safety, and welfare concerns.23 Moreover, the Commission did not identify any aspect of the application that failed to conform to the requirements in the County Code. The Superior Court initially remanded the case to the Commission so that “the Commission can make its determination based on the subdivision regula[242]*242tions, the zoning regulations and any other pertinent regulations contained within the KCC.”24 After the case returned to the Superior Court, the court instructed the Commission as follows:
(1) [I]f the Commission finds that all the regulations are complied with, the plan is approved; (2) if the Commission finds that all the regulations are complied with, but the Commission has some concerns it desires to condition final plan approval on, the approval is made contingent on the completion of those requirements; (3) if the Commission finds that some regulation is not complied with, the plan is denied; or (4) if the Commission finds that in order to determine if the regulations have been complied with more information is required, the plan is tabled until the information has been provided.25
That court’s instruction was legally correct.
The dissent implies that our interpretation of 9 Del. C. § 4811 reduces the Commission to conducting a mere compliance check of a subdivision application to verify conformity with the County Code. This mischaracterizes our position. To summarize, the Commission may condition its approval of Ashburn’s subdivision application based on non-Code factors, such as agency recommendations, school capacity issues, and concerns regarding the health, safety and welfare of the community. The Commission may consider these issues and has discretion in formulating conditions on approval designed to harmonize and coordinate regional planning. But, the Commission’s power to impose conditions cannot be administratively enlarged to a power to deny a conforming application outright.26 In this case the Commission did not approve the application with conditions. Therefore, in denying Ashburn’s application, which fully complied with all provisions of the Kent County Code, the Commission exceeded its statutory power.
Because we conclude that the Superior Court and the Commission legally erred for the reasons stated above, we do not reach the issue of whether the Commission had substantial evidence to support its decision.
II. The Amendments to the County Code Do Not Apply to Ashbum’s Proposal
The remaining issue concerns the effect, if any, of the Kent County Code amendment enacted while this appeal was pending. To reiterate, on June 13, 2006, Kent County proposed ordinances to amend the County Code in a manner that would essentially foreclose future subdivision developments similar to that proposed by Ashburn. The proposed ordinances relating to traffic and school capacity were adopted on March 27, 2007, with an effective date retroactive to their introduction. These ordinances (known as the “Adequate [243]*243Public Facilities Ordinances”) do not apply to Ashburn’s proposal, however. The amendment, KCC § 187-90.2(E)(2), provides:
This section applies to all applications for major subdivision, conditional use site plans and site plan review for new construction filed after the effective date of this section, (underlining added)
The effective date of the new ordinance was June 13, 2006. Ashburn’s proposal was filed March 2, 2006, over three months earlier. Accordingly, the new ordinances are inapplicable to Ashburn’s subdivision proposal.
CONCLUSION
For the foregoing reasons, the judgment of the Superior Court is reversed with instructions to remand the case to the Commission to reconsider Ashburn’s subdivision application in a manner consistent with this Opinion.