diff --git a/src/building/services/building.service.ts b/src/building/services/building.service.ts
new file mode 100644
index 0000000..fbaf8cb
--- /dev/null
+++ b/src/building/services/building.service.ts
@@ -0,0 +1,182 @@
+import { GetBuildingChildDto } from '../dtos/get.building.dto';
+import { SpaceTypeRepository } from '../../../libs/common/src/modules/space-type/repositories/space.type.repository';
+import { Injectable, HttpException, HttpStatus } from '@nestjs/common';
+import { SpaceRepository } from '@app/common/modules/space/repositories';
+import { AddBuildingDto } from '../dtos';
+import {
+  BuildingChildInterface,
+  BuildingParentInterface,
+  GetBuildingByUuidInterface,
+} from '../interface/building.interface';
+import { SpaceEntity } from '@app/common/modules/space/entities';
+
+@Injectable()
+export class BuildingService {
+  constructor(
+    private readonly spaceRepository: SpaceRepository,
+    private readonly spaceTypeRepository: SpaceTypeRepository,
+  ) {}
+
+  async addBuilding(addBuildingDto: AddBuildingDto) {
+    try {
+      const spaceType = await this.spaceTypeRepository.findOne({
+        where: {
+          type: 'building',
+        },
+      });
+
+      await this.spaceRepository.save({
+        spaceName: addBuildingDto.buildingName,
+        parent: { uuid: addBuildingDto.communityUuid },
+        spaceType: { uuid: spaceType.uuid },
+      });
+    } catch (err) {
+      throw new HttpException(err.message, HttpStatus.INTERNAL_SERVER_ERROR);
+    }
+  }
+
+  async getBuildingByUuid(
+    buildingUuid: string,
+  ): Promise<GetBuildingByUuidInterface> {
+    try {
+      const building = await this.spaceRepository.findOne({
+        where: {
+          uuid: buildingUuid,
+          spaceType: {
+            type: 'building',
+          },
+        },
+        relations: ['spaceType'],
+      });
+      if (!building) {
+        throw new HttpException('Building not found', HttpStatus.NOT_FOUND);
+      }
+      return {
+        uuid: building.uuid,
+        createdAt: building.createdAt,
+        updatedAt: building.updatedAt,
+        name: building.spaceName,
+        type: building.spaceType.type,
+      };
+    } catch (err) {
+      throw new HttpException(
+        err.message,
+        err.status || HttpStatus.INTERNAL_SERVER_ERROR,
+      );
+    }
+  }
+  async getBuildingChildByUuid(
+    buildingUuid: string,
+    getBuildingChildDto: GetBuildingChildDto,
+  ): Promise<BuildingChildInterface> {
+    const { includeSubSpaces, page, pageSize } = getBuildingChildDto;
+
+    const space = await this.spaceRepository.findOneOrFail({
+      where: { uuid: buildingUuid },
+      relations: ['children', 'spaceType'],
+    });
+
+    if (space.spaceType.type !== 'building') {
+      throw new HttpException('Building not found', HttpStatus.NOT_FOUND);
+    }
+
+    const totalCount = await this.spaceRepository.count({
+      where: { parent: { uuid: space.uuid } },
+    });
+
+    const children = await this.buildHierarchy(
+      space,
+      includeSubSpaces,
+      page,
+      pageSize,
+    );
+
+    return {
+      uuid: space.uuid,
+      name: space.spaceName,
+      type: space.spaceType.type,
+      totalCount,
+      children,
+    };
+  }
+
+  private async buildHierarchy(
+    space: SpaceEntity,
+    includeSubSpaces: boolean,
+    page: number,
+    pageSize: number,
+  ): Promise<BuildingChildInterface[]> {
+    const children = await this.spaceRepository.find({
+      where: { parent: { uuid: space.uuid } },
+      relations: ['spaceType'],
+      skip: (page - 1) * pageSize,
+      take: pageSize,
+    });
+
+    if (!children || children.length === 0 || !includeSubSpaces) {
+      return children
+        .filter(
+          (child) =>
+            child.spaceType.type !== 'building' &&
+            child.spaceType.type !== 'community',
+        ) // Filter remaining building and community types
+        .map((child) => ({
+          uuid: child.uuid,
+          name: child.spaceName,
+          type: child.spaceType.type,
+        }));
+    }
+
+    const childHierarchies = await Promise.all(
+      children
+        .filter(
+          (child) =>
+            child.spaceType.type !== 'building' &&
+            child.spaceType.type !== 'community',
+        ) // Filter remaining building and community types
+        .map(async (child) => ({
+          uuid: child.uuid,
+          name: child.spaceName,
+          type: child.spaceType.type,
+          children: await this.buildHierarchy(child, true, 1, pageSize),
+        })),
+    );
+
+    return childHierarchies;
+  }
+
+  async getBuildingParentByUuid(
+    buildingUuid: string,
+  ): Promise<BuildingParentInterface> {
+    try {
+      const building = await this.spaceRepository.findOne({
+        where: {
+          uuid: buildingUuid,
+          spaceType: {
+            type: 'building',
+          },
+        },
+        relations: ['spaceType', 'parent', 'parent.spaceType'],
+      });
+      if (!building) {
+        throw new HttpException('Building not found', HttpStatus.NOT_FOUND);
+      }
+
+      return {
+        uuid: building.uuid,
+        name: building.spaceName,
+        type: building.spaceType.type,
+        parent: {
+          uuid: building.parent.uuid,
+          name: building.parent.spaceName,
+          type: building.parent.spaceType.type,
+        },
+      };
+    } catch (err) {
+      throw new HttpException(
+        err.message,
+        err.status || HttpStatus.INTERNAL_SERVER_ERROR,
+      );
+    }
+  }
+}
diff --git a/src/building/services/index.ts b/src/building/services/index.ts
new file mode 100644
index 0000000..7b260d2
--- /dev/null
+++ b/src/building/services/index.ts
@@ -0,0 +1 @@
+export * from './building.service';
diff --git a/src/middleware/CheckBuildingMiddleware.ts b/src/middleware/CheckBuildingMiddleware.ts
new file mode 100644
index 0000000..92a5aba
--- /dev/null
+++ b/src/middleware/CheckBuildingMiddleware.ts
@@ -0,0 +1,74 @@
+import { SpaceRepository } from '@app/common/modules/space/repositories';
+import {
+  Injectable,
+  NestMiddleware,
+  HttpStatus,
+  HttpException,
+} from '@nestjs/common';
+import { Request, Response, NextFunction } from 'express';
+
+@Injectable()
+export class CheckBuildingMiddleware implements NestMiddleware {
+  constructor(private readonly spaceRepository: SpaceRepository) {}
+
+  async use(req: Request, res: Response, next: NextFunction) {
+    try {
+      // Destructure request body for cleaner code
+      const { buildingName, communityUuid } = req.body;
+
+      // Guard clauses for early return
+      if (!buildingName) {
+        return res.status(HttpStatus.BAD_REQUEST).json({
+          statusCode: HttpStatus.BAD_REQUEST,
+          message: 'buildingName is required',
+        });
+      }
+
+      if (!communityUuid) {
+        return res.status(HttpStatus.BAD_REQUEST).json({
+          statusCode: HttpStatus.BAD_REQUEST,
+          message: 'communityUuid is required',
+        });
+      }
+
+      // Call function to check if community is a building
+      await this.checkCommunityIsBuilding(communityUuid);
+
+      // Call next middleware
+      next();
+    } catch (error) {
+      // Handle errors
+      this.handleMiddlewareError(error, res);
+    }
+  }
+
+  async checkCommunityIsBuilding(communityUuid: string) {
+    const communityData = await this.spaceRepository.findOne({
+      where: { uuid: communityUuid },
+      relations: ['spaceType'],
+    });
+
+    // Throw error if community not found
+    if (!communityData) {
+      throw new HttpException('Community not found', HttpStatus.NOT_FOUND);
+    }
+
+    // Throw error if community is not of type 'community'
+    if (communityData.spaceType.type !== 'community') {
+      throw new HttpException(
+        "communityUuid is not of type 'community'",
+        HttpStatus.BAD_REQUEST,
+      );
+    }
+  }
+
+  // Function to handle middleware errors
+  private handleMiddlewareError(error: Error, res: Response) {
+    const status =
+      error instanceof HttpException
+        ? error.getStatus()
+        : HttpStatus.INTERNAL_SERVER_ERROR;
+    const message = error.message || 'Internal server error';
+    res.status(status).json({ statusCode: status, message });
+  }
+}