Nassau County commission approves setback waivers to preserve mature oaks in Rivergreen Estates

The Nassau County commission on Sept. 23 approved five conditional building‑setback waivers submitted by Rivergreen Estates LLC, each intended to preserve large, protected trees on newly platted single‑family lots in the RS‑2 zoning district.

Senior planner Drew Pearson told the commission the requests are reviewed under the county’s tree‑protection provisions (LDC §37.02(q)(1)(c)) and the Development Review Committee recommended conditional approval. "This provision is not really intended to waive the preservation or replacement requirements, but rather address the characteristics of the development," Pearson said, summarizing staff analysis and the DRC recommendation.

Why it matters: The applicant sought reductions to front, side and rear setbacks on six lots so houses could be repositioned or built on pier‑and‑lintel foundations that reduce root disturbance. Staff and the county arborist concluded the proposed designs and construction methods would better protect a cluster of large live oaks and other protected trees than strict enforcement of the setbacks, which staff said would likely lead the developer to reconfigure footprints in a way that would remove additional protected trees.

What the applications proposed: Across the six lots the plans identified 27 protected trees meeting the 5‑inch caliper threshold and several specimen live oaks (trees with calipers near or above 40 inches). Typical waiver requests reduced required setbacks by a few feet (examples recorded in staff exhibits include front setbacks reduced from 25 feet to as little as 8 feet 2.75 inches on one lot, and internal side setbacks reduced to roughly 4–6 feet on another), while the developer proposes a mix of raised foundations, narrower porches and modified floor plans to reduce impacts on root systems.

Conditions and enforcement: For each approval the commission attached staff‑recommended conditions: incorporation of the tree protection measures shown in the submitted tree protection and replacement plans, preservation of the identified specimen and protected trees (subject to the county arborist’s authority to permit removal if a tree later fails), installation of tree‑protection barricades and an on‑site preconstruction meeting with the county arborist before any construction begins. The DRC also required that trees removed under a separate tree‑removal permit follow replacement calculations under the code.

Notable amendment: On one lot (advertised with two specimen and two protected trees), the commission amended the condition to preserve two specimen trees and only one protected tree after staff and the arborist reported that a 10‑inch oak adjacent to overhead utilities had been severely damaged by a utility company trimming operation during the application process. The amended condition allows removal of that damaged tree; the rest of the trees on that lot remain subject to preservation conditions.

Debate and dissent: The most sustained debate centered on whether the setback waivers were genuinely necessary to protect tree resources or whether they were being used to increase house massing beyond what would fit inside the original setback envelope. Board member Flick repeatedly asked whether the proposed house footprints "would have fit within the original envelope" and argued the plans did not provide sufficient, specific measurements demonstrating that reductions were required to protect particular trees. Pearson and the applicant’s arborist, Mark White, responded that pier‑and‑lintel foundations, reduced second‑floor massing and repositioning of porches would protect critical root zones and that denial of waivers could lead the developer to reconfigure lots and remove additional large oaks.

Quotes from the meeting: "This is somewhat of a continuation of the October 1 meeting — the developer is retaining a lot of protected trees to make the project economically viable," Drew Pearson said during his presentation. Arborist Mark White told the commission, "By retaining all these trees, they absorb water" and pointed to existing swales and drainage that the project design intends to preserve.

Votes and outcome: Each of the five applications heard that night was approved with the DRC‑recommended conditions; recorded votes on the individual items were 3–1 in each case, with Board member Flick voting no and Board members Klima, Sherman and Chair Linda Bell voting yes. The approvals are conditional on the measures listed above and on the developer meeting standard lot‑coverage and building‑permit checks at the time of permit application.

What’s next: The approvals allow the developer to proceed to building‑permit review with the approved waiver conditions in place. Any later request to remove a tree because it becomes hazardous will require an arborist report and an administrative tree‑removal permit per county rules; the preconstruction meeting and barricade inspections are intended to reduce that risk during construction.

Context: The waivers were considered under LDC §37.02(q)(1)(c) (tree protection/waiver criteria) and follow a DRC review. The commission noted that the ordinance gives it authority to consider setback waivers for the narrow purpose of preserving natural areas and tree canopy but does not relieve the applicant of lot‑coverage or other building‑permit requirements that are evaluated during subsequent development‑services reviews.