Placing combo buildings near each other is the one of the best ways to increase land value. Combo buildings do not have to be built side by side, they do have to be between each other's area of affect. Below is a list of these combos. Note: There are also numerous hidden combos which are listed at the bottom of the page.
Picnic Combo
Park + Lunches 2 Go + Bakery
Sweets Combo
Cakery + Creperie + Donut Shop
Chubby Combo
Ramen Bar + Pizzeria + Donut Shop
Eating-Out Combo
Steakhouse + Restaurant + Fast 'n' Fried
Groceries Combo
Supermarket + Green grocer + Fishmonger
Clean Tunes Combo
Sauna + Cell Shop + Music
Lazy Day Combo
Blogbuster + Bowling Alley + Game Arcade
Jolly Combo
Music Shop + Florist + Cakery
Family Combo
Park + Game Shop + Toy Shop
Convenient Combo
Supermarket + 24-7 Mart + Drugstore
Chill-Out Combo
Bookstore + Cafe + Florist
Hi-Tec Combo
PC Shop + Cell Shop + Home Elec.
Otaku Combo
Anime Shop + Game Shop + Toy Shop
Old-Timey Combo
Candy Shop + Shrine + Sauna
Seaside Combo
Beach House + Wharft + Fishmonger
Local Combo
Cakery + Greengrocer + Florist
Student Combo
School + Steakhouse + Diner
Lunch Combo
Luches 2 Go + Bakery + Cafe
Silicon Combo
Game Shop + Cell Shop + PC Shop
Fishy Combo
Fishing Pond + Fishmonger + Aquarium
Bikers Combo
Pizzeria + Motorcycle Shop + Fast 'n' Fried
Meet-Up Combo
Cafe + Diner + Clock Tower
Fresh Food Combo
Greengrocer + Restaurant + Fishmonger
Movie Combo
Anime Shop + Cinema + Blogbuster
Education Combo
School + Cram School + Bookstore
Housekeeper Combo
Supermarket + Dry Cleaner + Local Center
Gamers Combo
Game Shop + PC Shop + Game Arcade
Weekend Combo
Sushi Joint + BBQ House + Pizzeria
H. Springs Combo
Sauna + Spa + Spa Hotel
Health Combo
Hospital + Gym + Sauna
Shopping Combo
Supermarket + Boutique + Jewelry
Gourmet Combo
Tapas Bar + Sushi Joint + Ramen Bar
Fashion Combo
Boutique + Cakery + Drugstore
Intellect Combo
Bookstore + Museum + School
Fitness Combo
Heated Pool + Gym + Drugstore
Nature Combo
Ranch + Park + Camp Site
Fresh-Made Combo
Donut Shop + Ranch + Creperie
Musical Combo
Music Shop + Concert Hall + Blogbuster
House Move Combo
Estate Agent + Info Center + Local Center
Fashion Combo
Boutique + Shoe Shop + Beautician
Medical Combo
Hospital + Drugstore + 24-7 Mart
Vehicle Combo
Bike Shop + Motorcycle Shop + Car Dealer
Touristy Combo
Spa Hotel + Temple + Gift Shop
Rural Combo
Farm + Ranch + Fishing Pond
Day Out Combo
Museum + Aquarium + Cinema
Bodyguard Combo
Security Inc. + Gym + Camp Site
Estate Combo
Contractors + Estate Agent + Furniture Shop
Posh Combo
Jewelry Shop + 3-Star Hotel + Bank
Pleasure Combo
Game Arcade + Bowling Alley + Casino
Culture Combo
Jewelry Shop + Museum + Cinema
Industry Combo
Motorcycle Shop + Car Dealer + School
Animal Combo
Pet Shop + Ranch + Zoo
Workaholic Combo
Office Bldg + Hospital + Dry Cleaner
Office Clerk Combo
Shoe Shop + Office Bldg + Tapas bar
Sporty Combo
Stadium + Baseball Park + Gym
DIY Combo
Dept.Store + Furniture Shop + Home Elec.
Grown-up Combo
Dance Club + Casino + Tapas Bar
Oriental Combo
Pagoda + Shrine + Monument
Celeb Combo
Castel + Boutique + Dept. Store
Business Combo
High-Rise + Skycraper + Bank
Sinister Combo
Comms Towers + Hospital + School
Hollywood Combo
Cinema + Theme Park + Jewelry Shop
Kairo Park Combo
Kairo Statue + Game Shop + Kairo Bldg
Eventful Combo
Cinema + Theme park + Concert Hall
Critter Combo
Aquarium + Zoo + Ranch
Amusement
Comms Towers + TV Station + Concert Hall
High-Rise
High-Rise + Skycraper+ Kairo Bldg
Castle Combo
Palace + Castle + Kairo Statue
Aviation Combo
Rocket Hall + helipad + Airport
Date Combo
Theme Park + Zoo + Cinema
Special Combo
Airport + TV Station + Skyscraper
Time Saver Combo
Dry cleaner + Furniture shop + Subway
Food Special Combo
Restaurant + Observation Deck + Bronze Trophy
Beef Special Combo
Steakhouse + Observation Deck + Bronze Trophy
Sweet Special Combo
Creperie + Observation Deck + Bronze Trophy
Hidden Combo List
Healthcare Combo
Local centre + Hospital + Subway
Money Drain Combo
Lotto Ticket Shop + Sushi Joint + Tapas Bar
Live Gig Combo
Cell shop + Comms Tower + Concert Hall
Outfitters Combo
Sport Shop + Shoe Shop + Boutique
Souvenir Combo
Candy Shop + Monument + Gift Shop
Seaside Tour Combo
Tapas bar + Beach House + Castle
Security Combo
Jewelry Shop +Security Inc + 3 Star Hotel
Soak Combo
Heated Pool + Dry Cleaner + Sauna
Medicine Combo
Clinic + Drugstore + 24/7 Mart
Car Special Combo
Parking Lot + Silver Trophy + Car Dealer
Museum Special Combo
Diner + Silver Trophy + Museum
Spring Deal Combo
Boutique + Cherry Tree + Dept. Store
Schoolday Combo
Drugstore + School + Subway
Historic Special Combo
Museum + Silver Trophy + Castle
Fun Special Combo
Beach House + Gold Trophy + Theme Park
Pumpkin Combo
Pumpkin Statue + Gold Trophy + Car Dealer
Secretary Combo
Secretary Statue + Gold Trophy + Theme Park
Aqua Combo
Fire Hydrant + Fishing Pond + Heated Pool
Pet Combo
Doggie Statue + Beautician + Pet Shop
Lunch-Break Combo
Trash Cans + 24-7 Mart + School
Agritourism Combo
Farm + Greengrocer + Spa
Alpine Bread Combo
Bakery + Moutain + Farm
Grow Up Combo
Dance club + Casino + Tapas bar
Small Town Combo
Sport combo + School + Candy Shop
Day Off Combo
Bookstore + Bench + Cafe
Telecom Combo
Phone Box + PC Shop + Cell Shop
Farm Lunch Combo
Farm + hydrangea + lunch2go
Foodie Combo
Cakery + Farm + Ranch
Blessing Combo
Shrine + Farm + Monument
Night out Combo
Dance Club + Tapas Bar + Drugstore
Never-Lost Combo
Info Center + Local Center + Comms Tower
Revive Combo
Clinic + Spa + Sauna
TV Combo
Utility Pole + Comms Tower + Home Elec
Week End Combo
Sushi Joint + BBQ House + Pizzeria
Games & Toys Combo
Game Shop + Home Elec + Toy Shop
Biker Show Combo
Blogbuster + Motocycle Shop + PC Shop
Tranquil Combo
Moutain + Pet shop + Fishing Pond