Garden City, 90 Fifth St., $2.695 million

The green lacquered library in this five-bedroom Garden City Tudor is the heart of the home, says listing agent Stephanie Cullum. She says it's the room that draws the family together and contains a collection of volumes they have read and loved over the years.

Cullum says the house, which was built in 1906, combines the formality of an English manor with the functionality of family friendly features. There are four bathrooms and two half-baths, a formal dining room, an eat-in kitchen, a fireplace, a mudroom and a wine cellar.

The house has 10-foot ceilings, multiple sets of French doors and hardwood floors throughout. The property features a circular driveway and a three-car garage. Taxes are $35,937. Stephanie Cullum and Patricia O'Grady, coach Realtors, 516-746-5511.

Centerport, 14 Gina Dr., $2.299 million

If you want a house with a library, check out this home on Gina Drive in Centerport. It is on the market in August 2015 for $2.299 million. Photo Credit: Douglas Elliman

The library of this Centerport home is a sanctuary for the book collector owner, says listing agent Melanie Mazzeo. The owner built the library as an extension, using exacting standards to be sure the 5,300 volumes it contains are kept from direct sunlight. The library is 31.5 feet long and 10 feet wide, with 14.5-foot ceilings. It is on the third floor and opens to an office with views of Northport Harbor and bay.

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The three-bedroom house is on 158 feet of waterfront with a private beach, deeded mooring and a dock with a new seawall and catwalk. The three-quarter-acre property features an outdoor kitchen, a hot tub, firepit and multilevel decks.

The split-level, which was built in 1974, has two master suites, three bathrooms and a half-bath, a formal dining room and an updated kitchen. The house also has a fireplace, skylight, in-ground sprinklers and a detached two-car garage. Taxes are $28,650. Melanie Mazzeo, Douglas Elliman Real Estate, 631-766-3450.

Huntington, 61 Chichester Rd., $869,000

This Huntington Colonial features a library that also serves as an office and sitting room for the homeowner. The five-bedroom house was built in 2001. The master suite comes with a Jacuzzi.

The Huntington Colonial features a library that also serves as an office and sitting room for the homeowner. Photo Credit: Charles Rutenberg Realty

There are a five bathrooms and a half-bath and guest quarters. The house has an open floor plan, with two eat-in kitchens as well as a formal dining room, two fireplaces, and a full finished basement where there's a gym, full bath and sauna. Taxes are $22,209. Frank Mann, Charles Rutenberg Realty, 631-514-4960.