The Martha’s Vineyard Commission last week plowed through a wide-ranging agenda that included a proposed historic house demolition and a new timeframe for completing the Cape Cod Five Cent Savings Bank in Vineyard Haven.

A historic but deteriorating house at 29 Franklin street in Vineyard Haven will come under review by the commission in light of plans to demolish the building and replace it with a larger house in the same style.

Owners William Westman and Cees van Eijk had originally planned to restore the 19th-century Greek Revival as a primary residence for Mr. van Eijk. But in materials submitted to the commission, Mr. Westman pointed out many problems with the structure, including an inadequately dug foundation, extensive rot and bug damage, and a tree growing through the front bedroom.

“Things are falling off the building,” he told commissioners on Thursday. “Everything has to be replaced.” The new building would resemble the original, but with a two-story addition to the side.

Commissioner Clarence A. (Trip) Barnes 3rd agreed the house was in dire straits. “We knew that it was in a lot of trouble from underneath,” he said, recalling the interest of one of his employees when the house went on the market. “I think it’s crossed the line.”

But others argued that the house’s age, style, and visibility, along with the absence of town-level review beyond the zoning board, made it a candidate for review as a development of regional impact (DRI).

Commissioner Michael Kim, who owns an architecture firm in Brookline, questioned whether the building rose to the level of regional significance. “It’s certainly old, it has pleasing historical proportions,” he said. “It is certainly on a very visible site. Does that make it regionally impactful?”

Commissioner Joan Malkin argued that it does, regardless of how one chooses to weigh the various factors. “We view ourselves as sharing this heritage,” she said.

The commission voted 10-2 to review the project as a DRI. Mr. Kim, the latest governor’s appointee to the commission, said he would not be cleared to cast votes until April.

In other business, the commission granted a two-year extension to a deadline for the Cape Cod Five Cent Savings Bank (also a DRI) to replace its modular building with a more permanent structure by 2019. An earlier decision had required the bank to submit plans for a permanent building by this August.

Attorney Geoghan Coogan, representing the bank, said efforts to extend the town’s sewer line to the State Road business district presented a new variable. An article asking voters to approve $50,000 for engineering and design work related to the new sewer district will appear on the town meeting warrant in April.

“To develop that site properly and smartly means tying in to the town sewer, and we need more time,” Mr. Coogan said.

But some commissioners questioned the logic, in light of statements by town wastewater commissioner and selectman Melinda Loberg, who said that the town plans to extend the line by 2019 and that the bank already has permission to connect.

“If that’s the case, why can’t you plan the site?” said Mr. Kim.

“It seems to me that by the deadline you could be ready to go,” said Mrs. Malkin, noting concerns in 2015 surrounding the timeframe.

Commissioner Josh Goldstein, who manages the Mansion House in Vineyard Haven, sided with the bank. “As a business owner, I wouldn’t want to spend the money until the pipe was in the ground,” he said.

The commission voted 12-0 to extend the deadline, with Linda Sibley abstaining since she formerly owned a neighboring business. Plans for a new structure are now due by August 2019, with a deadline of 2021 for demolishing the modular building.

The commission decided not to review plans by Vineyard Vines to open a store on Main street in Vineyard Haven. The project qualified as a potential DRI since it involves a business with more than 10 stores internationally, although Mrs. Sibley said it did not match the intent of the DRI trigger.

“This is a local business which has been very successful and has expanded to the outside world,” she said. “And this is not an increase in use.”

But commissioner Ben Robinson didn’t necessarily see Vineyard Vines as a local business, since a large percentage of its business is off-Island.

Others agreed with Mrs. Sibley that the project did not represent the type of development the MVC rules were meant to control, although Mr. Kim argued that the rules should be clearer.

Commissioner Gail Barmakian took a different approach. “There’s flexibility and ambiguity in everything,” she said.

A motion not to review the project passed unanimously.

Commissioners unanimously approved a four-lot subdivision off Middle Line road in Chilmark. The plan by the Eileen S. Mayhew Revocable Trust makes use of the town’s flexible siting bylaw, which allows for lot sizes under three acres, in exchange for open space preservation. About seven acres with space for a trail would be sold to the Martha’s Vineyard Land Bank.

Before adjourning, the commission acknowledged widespread public opposition to a plan by Eversource Energy to apply herbicides under some of its power lines on the Vineyard, and agreed to work with Island towns on a coordinated response. But they also agreed that the issue extends beyond Eversource.

“Eversource does this maybe every four years,” Mr. Robinson said, adding that landscapers and homeowners apply herbicides on a daily basis. “If you really want to eliminate this, you’ve got to look at a much broader ban Islandwide.”

Commissioners touched on various approaches, including forming a regional committee similar to the one that set the stage for Islandwide fertilizer regulations in 2015, and the possibility of creating a special overlay district.

A motion by Mrs. Sibley to coordinate a response to the Eversource plan by writing to Island towns passed unanimously.