All outside walls of the ground floor of every residential structure shall be constructed of 100 percent masonry and/or glass. It is provided, however, that up to, but not exceeding, 20 percent of the outside walls may be covered or constructed of other materials for decorative, architectural or other design purposes. Such other material shall be impervious material that is required for outside walls by the residential building code mandated by the state and the ordinances of the city.

All outside walls of the ground floor of every residential structure shall be constructed of 100 percent masonry, masonry-type products and/or glass, or may be of a log cabin type material and design. It is provided, however, that up to, but not exceeding, 20 percent of the outside walls may be covered or constructed of other materials for decorative, architectural or other design purposes. Such other material shall be impervious material that is required for outside walls by the residential building code mandated by the state and the ordinances of the city.

These construction regulations shall apply to all the following:

All residential structures must have at least six feet of attic space from the attic floor to the highest point of the attic framing.

All residential structures must have at least 1,200 square feet of living space.

All outside walls of the ground floor of every residential structure shall be constructed of 100 percent masonry and/or glass. It is provided, however, that up to, but not exceeding, 20 percent of the outside walls may be covered or constructed of other materials for decorative, architectural or other design purposes. Such other materials shall be impervious material that is required for outside walls by the residential building code mandated by the state and the ordinances of the city.

All outside walls of the ground floor of every residential structure shall be constructed of 100 percent masonry, masonry-type products and/or glass, or may be of a log cabin type material and design. It is provided, however, that up to, but not exceeding, 20 percent of the outside walls may be covered or constructed of other materials for decorative, architectural or other design purposes. Such other material shall be impervious material that is required for outside walls by the residential building code mandated by the state and the ordinances of the city.

These construction regulations shall apply to all the following:

All residential structures must have at least six feet of attic space from the attic floor to the highest point of the attic framing.

All residential structures must have at least 1,000 square feet of living space per unit.

Manufactured housing design and construction will comply with construction and safety standards published by the Department of Housing and Urban Development pursuant to the requirements of the National Mobile Home and Safety Standards Act of 1974 and all manufactured homes will be subject to inspection by the building official.

All manufactured homes shall be set on a solid slab structure and/or 18-inch to 20-inch runners and/or pier and beam construction consistent with Rural Economic and Community Development Administration (formerly Farmer's Home Administration) standards. Additional rooms and enclosed porches shall be constructed on a solid slab.

Tie-downs will be required and will be secured prior to occupancy.

Underpinning and skirting will be required and will be installed prior to occupancy. Upon determination by the city administrator that a bona fide hardship will be incurred by this provision, a waiver of up to 90 days' occupancy may be granted prior to strict enforcement of this provision.

Accessory buildings will be either manufactured or constructed in accordance with city codes.

All manufactured homes and modular homes shall comply with all regulations of the state and such regulations are hereby incorporated into this division.

All single-story buildings hereafter constructed or placed in the CBD shall have at least 75 percent of the exterior wall surface constructed of masonry and/or glass pane. All buildings having more than a single story hereafter constructed or placed in the CBD shall have at least 50 percent of the exterior wall surface constructed of masonry and/or glass pane. All additions hereafter constructed to buildings in the CBD shall have at least 50 percent of the exterior wall surface constructed of masonry and/or glass pane.

Projection signs may be erected in the CBD in accordance with the requirements of this subsection. The horizontal portion of any projecting sign shall not be more than six feet in length measured from the building face and shall not be closer than two feet from the back of the curb line. The height of a projection sign shall not exceed four feet and shall be an integral part of the architectural design of the attached building. The vertical clearance of a projection sign shall be as shown below:

New development sites within the CBD shall not be permitted unless integrated with other historic buildings within the area to maintain the functional and visual appearance of the historic architectural style.

Buildings within CBD shall be oriented toward the streets and pedestrian traffic in order to create a cohesive, pedestrian-oriented development plan. Building fronts and sidewalks may also be maintained for outdoor uses such as cafés, restaurant seating, street side seating, etc. Parking areas may be located in the front or rear of buildings to improve the overall appearance of the development from the street.

New development/renovation in CBD may incorporate design elements dating from the 1800's and early 1900's. Retail uses are preferred with parking in common areas. Roof lines featuring parapets, articulated cornice line, articulated ground floor levels, and strong corner treatments are a few of the design options. Exterior finishes should utilize the classic base colors of the Texas environment, e.g., tan, ochre, beige and terra-cotta.

A high quality durable base material, such as terra-cotta, natural stone, cast stone, clay fired tile, or other approved masonry material is suggested for building facades abutting the sidewalk. The base should be a minimum of 18 inches in height and appropriately proportioned and detailed for the facade of the building.

A minimum of three of the following elements must be incorporated in the design of a new or refurbished building in the CBD:

Each lot within the CBD must provide on-site pedestrian facilities or public plazas or spaces that encourage pedestrian traffic on and to adjacent properties.

Private new developments and expansions to existing developments within the CBD shall coordinate the selection and installation of street furniture and lighting with the standards selected by the city for the public areas adjacent to streets in order to maintain design continuity.

A nonconforming use may be continued on a site indefinitely until the nonconforming use ceases for a minimum of six months or if more than 50 percent of the building's value is diminished by damage. In the event of a casualty in which no more than 50 percent of the value of the structure is damaged or destroyed, the structure(s) may be rebuilt. Nonconforming buildings with more than 50 percent of the building's value is diminished by damage from a casualty must be rebuilt to current standards.

All single-story buildings hereafter constructed or placed in this district shall have at least 75 percent of those exterior wall surfaces fronting a public street constructed of masonry and/or glass pane.

All buildings having more than a single story hereafter constructed or placed in the district shall have at least 50 percent of those exterior wall surfaces fronting a public street constructed of masonry and/or glass pane.

All additions hereafter constructed to buildings in this district shall have at least 50 percent of those exterior wall surfaces fronting a public street constructed of masonry and/or glass pane.