NYC Department of Records and Information Services (DORIS)

Understanding NYC DORIS, its historical records, and how those records can support New York City building research.

The New York City Department of Records and Information Services (NYC DORIS) preserves and provides access to significant collections of municipal records, photographs, maps, plans, publications and other historical materials. For property owners and project teams, those records can be especially useful when a present-day building question depends on evidence from an earlier period.

This page introduces the agency and the records most relevant to building and property research. For SLK Buildings’ detailed service pages, record-by-record guidance and related research topics, continue to the NYC DORIS Property Records and Building Research hub. Historical evidence may support a project review, but it does not replace a determination by the Department of Buildings, Landmarks Preservation Commission or another responsible agency.

What Is NYC DORIS?

Established in 1977, the New York City Department of Records and Information Services (DORIS) preserves and provides public access to historical and contemporary records and information about New York City government. DORIS operates the Municipal Archives, Municipal Library and Records Center, and it supports citywide records-management functions.

For an SLK project, the important question is usually not the full scope of DORIS as an agency. It is whether a particular historical record can help answer a property-specific question: What did the building look like? What application number should be researched next? Is there an older assessment description? Does a surviving plan or folder help establish a chronology? That narrower research focus helps property owners and project teams identify the DORIS records most relevant to a specific building question.

Explore SLK Buildings’ NYC DORIS Research Hub

For project-focused guidance, use the NYC DORIS Property Records and Building Research hub. It organizes the DORIS subjects that are most relevant to SLK Buildings’ documented records-research, project-coordination and agency-support services.

Explore NYC DORIS Property Records and Building Research

SLK Buildings assists property owners with NYC DORIS record research, document retrieval, filing coordination, and access to official property and historical records.

Core Department of Records and Information Services Functions

Municipal Archives and preservation ~ DORIS preserves historical City-government records and provides access to paper records, digital collections, photographs, maps, ledgers, docket books, blueprints and other archival materials.
Records management ~ DORIS develops citywide records-management policies and retention/disposition guidance for City agencies. This is an agency-governance function and is different from SLK’s project-specific property research.
Municipal Library and Government Publications Portal ~ DORIS maintains City-government publications and a permanent searchable portal for reports and other materials produced by City agencies.
Digital and public access ~ DORIS makes selected archival material available online and provides research-room access, collection guides and other research services. Not every record is digitized or immediately available.
OpenRECORDS and FOIL access ~ OpenRECORDS is the City platform for submitting Freedom of Information Law requests to NYC agencies. DORIS develops the platform, but each agency remains responsible for requests to records it holds; FOIL requests to DORIS itself are submitted through OpenRECORDS.
Public programs and education ~ DORIS also presents exhibits, programs and educational resources that broaden public access to City history. These activities provide broader context about DORIS, while SLK’s NYC DORIS research hub focuses specifically on building and property research.

Department of Records and Information Services Records for NYC Buildings

DORIS collections include several record types that may contribute to building research. Availability varies by collection, date, location and the survival of the individual file, so a collection description should not be treated as a guarantee that a particular property has a complete record.

Property cards ~ historical Department of Finance assessment records with ownership, building-classification and assessed-valuation information; copies are often requested as part of Letter of No Objection research.
Historical tax photographs ~ images from the City’s tax-photo programs that can document earlier visible building conditions and facade features.
Historical building plans ~ selected architectural plans and drawings, including the well-documented Lower Manhattan collection with geographic and date limits.
Block-and-lot folders and docket books ~ historical building-application material and indexes that can help identify filings and guide a more targeted records search.
Historical maps, atlases and assessment records ~ sources that can help trace changes in parcels, streets, buildings and recorded property descriptions.
Municipal Library and government publications ~ agency reports, laws, proceedings and other publications that can provide historical context for a project question.

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How DORIS Records Can Support a Building Project

Historical records are most useful when they are tied to a defined project question. A tax photograph may help document an earlier facade configuration. A docket entry may identify an application number that is not obvious from a modern search. A property card may contribute to a broader package of historical evidence. A plan or folder may help a design team compare earlier work with present conditions.

The records should be organized by source and date and compared with current DOB, zoning, LPC or other agency information. A historical record is evidence of what was documented at a particular time; it is not automatically proof of current legal use, a permit approval, a Certificate of Occupancy or an LPC approval. DOB’s own building-data guidance identifies DORIS plan, docket-book and block-and-lot collections as research sources while maintaining DOB’s separate role in building records and approvals.

NYC DORIS and NYC DOB Are Different Agencies

DORIS preserves and provides access to historical municipal records. The Department of Buildings administers building-code, filing, permit and occupancy processes. For example, NYC311 and DOB direct owners seeking proof of legal use for certain pre-1938 buildings to the DOB Letter of No Objection process, while historical property cards, photographs and other records may be part of the supporting research.

That distinction is important for every page in this cluster: SLK may use historical records to research and organize documentation, but the responsible agency makes the applicable determination.

Contact SLK Buildings About NYC DORIS Property Research

If a building project depends on historical records or an unresolved documentation question, contact SLK Buildings to discuss the research and coordination that may be appropriate. Share the property address, borough, block and lot, the records already available and the decision the research needs to support.

Contact SLK Buildings to Discuss Your Project

212-888-3888 | info@slkbuildings.com

Disclosure: SLK Buildings is a private consulting and construction-management firm and is not affiliated with NYC DORIS, NYC DOB, NYC LPC, or any government agency. Record availability and agency determinations remain with the responsible public agency.

🚧 Seeking Professional Guidance on NYC Department of Records and Information Services

Given the complexity of locating and interpreting historical New York City property records, property owners, developers, and design professionals may benefit from qualified assistance when researching records maintained by the NYC Department of Records and Information Services (DORIS). Identifying the appropriate records early can help clarify a property’s history and determine what additional documentation may be needed for a building project.

At SLK Buildings, we’ve spent over 25 years helping NYC homeowners, property owners, developers, and businesses navigate agency requirements, research building records, organize supporting documentation, and coordinate project filings. Our team can assist with research involving NYC property cards, historical tax photographs, historical building plans, docket books, maps, and other municipal records that may provide useful evidence about a property’s history.

Whether you’re researching a building’s historical use, preparing supporting documentation for a Letter of No Objection, documenting historic conditions for an LPC project, or trying to understand earlier building records, SLK Buildings can help organize the research and identify the records relevant to your project.

SLK Buildings assists Home Owners, Property Owners, Developers, and Design Professionals with NYC DORIS building and property records research:

SLK Buildings provides free educational content to help property owners understand their research options.

For those who prefer professional assistance, we’re available to coordinate records research, organize supporting documentation, and help determine how historical records may relate to the applicable NYC agency process.

Disclosure: SLK Buildings is a private consulting and construction-management firm and is not affiliated with NYC DORIS or any government agency. Historical records can support research and documentation, but the responsible agency makes any required determination or approval.

Frequently Asked Questions

What is NYC DORIS?

NYC DORIS is the New York City Department of Records and Information Services. Its functions include the Municipal Archives, Municipal Library, government publications and City records-management services.

Does DORIS have records for every NYC building?

No. DORIS maintains specific historical collections with different date ranges, geographic coverage and survival rates. Confirm the collection and property-specific availability before relying on a record for a project.

Can a DORIS record prove a building’s current legal use?

A historical record may support research, but current legal-use and occupancy questions are handled through the applicable DOB process and current records. A DORIS item should not be treated as a substitute for a required DOB determination.

Why are property cards important for some projects?

Property cards contain historical assessment information, and NYC311 says copies are often necessary when seeking a DOB Letter of No Objection. They are supporting evidence, not the LNO itself.

Can historical photographs help with landmark work?

Yes. LPC research guidance uses historical photographs and other archival sources to document historic appearance and changes. Their value depends on the project question and the property.

Where should I start if I need DORIS research for a building project?

Start with the NYC DORIS Property Records and Building Research hub, choose the record or research question that fits the project, and gather the property identifiers and existing agency records before requesting archival material.